/*  Prototype JavaScript framework, version 1.6.0.2
 *  (c) 2005-2008 Sam Stephenson
 *
 *  Prototype is freely distributable under the terms of an MIT-style license.
 *  For details, see the Prototype web site: http://www.prototypejs.org/
 *
 *--------------------------------------------------------------------------*/

var Prototype = {
  Version: '1.6.0.2',

  Browser: {
    IE:     !!(window.attachEvent && !window.opera),
    Opera:  !!window.opera,
    WebKit: navigator.userAgent.indexOf('AppleWebKit/') > -1,
    Gecko:  navigator.userAgent.indexOf('Gecko') > -1 && navigator.userAgent.indexOf('KHTML') == -1,
    MobileSafari: !!navigator.userAgent.match(/Apple.*Mobile.*Safari/)
  },

  BrowserFeatures: {
    XPath: !!document.evaluate,
    ElementExtensions: !!window.HTMLElement,
    SpecificElementExtensions:
      document.createElement('div').__proto__ &&
      document.createElement('div').__proto__ !==
        document.createElement('form').__proto__
  },

  ScriptFragment: '<script[^>]*>([\\S\\s]*?)<\/script>',
  JSONFilter: /^\/\*-secure-([\s\S]*)\*\/\s*$/,

  emptyFunction: function() { },
  K: function(x) { return x }
};

if (Prototype.Browser.MobileSafari)
  Prototype.BrowserFeatures.SpecificElementExtensions = false;

if (Prototype.Browser.Opera)
  Prototype.BrowserFeatures.SpecificElementExtensions = true;

/* Based on Alex Arnell's inheritance implementation. */
var Class = {
  create: function() {
    var parent = null, properties = $A(arguments);
    if (Object.isFunction(properties[0]))
      parent = properties.shift();

    function klass() {
      this.initialize.apply(this, arguments);
    }

    Object.extend(klass, Class.Methods);
    klass.superclass = parent;
    klass.subclasses = [];

    if (parent) {
      var subclass = function() { };
      subclass.prototype = parent.prototype;
      klass.prototype = new subclass;
      parent.subclasses.push(klass);
    }

    for (var i = 0; i < properties.length; i++)
      klass.addMethods(properties[i]);

    if (!klass.prototype.initialize)
      klass.prototype.initialize = Prototype.emptyFunction;

    klass.prototype.constructor = klass;

    return klass;
  }
};

Class.Methods = {
  addMethods: function(source) {
    var ancestor   = this.superclass && this.superclass.prototype;
    var properties = Object.keys(source);

    if (!Object.keys({ toString: true }).length)
      properties.push("toString", "valueOf");

    for (var i = 0, length = properties.length; i < length; i++) {
      var property = properties[i], value = source[property];
      if (ancestor && Object.isFunction(value) &&
          value.argumentNames().first() == "$super") {
        var method = value, value = Object.extend((function(m) {
          return function() { return ancestor[m].apply(this, arguments) };
        })(property).wrap(method), {
          valueOf:  function() { return method },
          toString: function() { return method.toString() }
        });
      }
      this.prototype[property] = value;
    }

    return this;
  }
};

var Abstract = { };

Object.extend = function(destination, source) {
  for (var property in source)
    destination[property] = source[property];
  return destination;
};

Object.extend(Object, {
  inspect: function(object) {
    try {
      if (Object.isUndefined(object)) return 'undefined';
      if (object === null) return 'null';
      return object.inspect ? object.inspect() : String(object);
    } catch (e) {
      if (e instanceof RangeError) return '...';
      throw e;
    }
  },

  toJSON: function(object) {
    var type = typeof object;
    switch (type) {
      case 'undefined':
      case 'function':
      case 'unknown': return;
      case 'boolean': return object.toString();
    }

    if (object === null) return 'null';
    if (object.toJSON) return object.toJSON();
    if (Object.isElement(object)) return;

    var results = [];
    for (var property in object) {
      var value = Object.toJSON(object[property]);
      if (!Object.isUndefined(value))
        results.push(property.toJSON() + ': ' + value);
    }

    return '{' + results.join(', ') + '}';
  },

  toQueryString: function(object) {
    return $H(object).toQueryString();
  },

  toHTML: function(object) {
    return object && object.toHTML ? object.toHTML() : String.interpret(object);
  },

  keys: function(object) {
    var keys = [];
    for (var property in object)
      keys.push(property);
    return keys;
  },

  values: function(object) {
    var values = [];
    for (var property in object)
      values.push(object[property]);
    return values;
  },

  clone: function(object) {
    return Object.extend({ }, object);
  },

  isElement: function(object) {
    return object && object.nodeType == 1;
  },

  isArray: function(object) {
    return object != null && typeof object == "object" &&
      'splice' in object && 'join' in object;
  },

  isHash: function(object) {
    return object instanceof Hash;
  },

  isFunction: function(object) {
    return typeof object == "function";
  },

  isString: function(object) {
    return typeof object == "string";
  },

  isNumber: function(object) {
    return typeof object == "number";
  },

  isUndefined: function(object) {
    return typeof object == "undefined";
  }
});

Object.extend(Function.prototype, {
  argumentNames: function() {
    var names = this.toString().match(/^[\s\(]*function[^(]*\((.*?)\)/)[1].split(",").invoke("strip");
    return names.length == 1 && !names[0] ? [] : names;
  },

  bind: function() {
    if (arguments.length < 2 && Object.isUndefined(arguments[0])) return this;
    var __method = this, args = $A(arguments), object = args.shift();
    return function() {
      return __method.apply(object, args.concat($A(arguments)));
    }
  },

  bindAsEventListener: function() {
    var __method = this, args = $A(arguments), object = args.shift();
    return function(event) {
      return __method.apply(object, [event || window.event].concat(args));
    }
  },

  curry: function() {
    if (!arguments.length) return this;
    var __method = this, args = $A(arguments);
    return function() {
      return __method.apply(this, args.concat($A(arguments)));
    }
  },

  delay: function() {
    var __method = this, args = $A(arguments), timeout = args.shift() * 1000;
    return window.setTimeout(function() {
      return __method.apply(__method, args);
    }, timeout);
  },

  wrap: function(wrapper) {
    var __method = this;
    return function() {
      return wrapper.apply(this, [__method.bind(this)].concat($A(arguments)));
    }
  },

  methodize: function() {
    if (this._methodized) return this._methodized;
    var __method = this;
    return this._methodized = function() {
      return __method.apply(null, [this].concat($A(arguments)));
    };
  }
});

Function.prototype.defer = Function.prototype.delay.curry(0.01);

Date.prototype.toJSON = function() {
  return '"' + this.getUTCFullYear() + '-' +
    (this.getUTCMonth() + 1).toPaddedString(2) + '-' +
    this.getUTCDate().toPaddedString(2) + 'T' +
    this.getUTCHours().toPaddedString(2) + ':' +
    this.getUTCMinutes().toPaddedString(2) + ':' +
    this.getUTCSeconds().toPaddedString(2) + 'Z"';
};

var Try = {
  these: function() {
    var returnValue;

    for (var i = 0, length = arguments.length; i < length; i++) {
      var lambda = arguments[i];
      try {
        returnValue = lambda();
        break;
      } catch (e) { }
    }

    return returnValue;
  }
};

RegExp.prototype.match = RegExp.prototype.test;

RegExp.escape = function(str) {
  return String(str).replace(/([.*+?^=!:${}()|[\]\/\\])/g, '\\$1');
};

/*--------------------------------------------------------------------------*/

var PeriodicalExecuter = Class.create({
  initialize: function(callback, frequency) {
    this.callback = callback;
    this.frequency = frequency;
    this.currentlyExecuting = false;

    this.registerCallback();
  },

  registerCallback: function() {
    this.timer = setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
  },

  execute: function() {
    this.callback(this);
  },

  stop: function() {
    if (!this.timer) return;
    clearInterval(this.timer);
    this.timer = null;
  },

  onTimerEvent: function() {
    if (!this.currentlyExecuting) {
      try {
        this.currentlyExecuting = true;
        this.execute();
      } finally {
        this.currentlyExecuting = false;
      }
    }
  }
});
Object.extend(String, {
  interpret: function(value) {
    return value == null ? '' : String(value);
  },
  specialChar: {
    '\b': '\\b',
    '\t': '\\t',
    '\n': '\\n',
    '\f': '\\f',
    '\r': '\\r',
    '\\': '\\\\'
  }
});

Object.extend(String.prototype, {
  gsub: function(pattern, replacement) {
    var result = '', source = this, match;
    replacement = arguments.callee.prepareReplacement(replacement);

    while (source.length > 0) {
      if (match = source.match(pattern)) {
        result += source.slice(0, match.index);
        result += String.interpret(replacement(match));
        source  = source.slice(match.index + match[0].length);
      } else {
        result += source, source = '';
      }
    }
    return result;
  },

  sub: function(pattern, replacement, count) {
    replacement = this.gsub.prepareReplacement(replacement);
    count = Object.isUndefined(count) ? 1 : count;

    return this.gsub(pattern, function(match) {
      if (--count < 0) return match[0];
      return replacement(match);
    });
  },

  scan: function(pattern, iterator) {
    this.gsub(pattern, iterator);
    return String(this);
  },

  truncate: function(length, truncation) {
    length = length || 30;
    truncation = Object.isUndefined(truncation) ? '...' : truncation;
    return this.length > length ?
      this.slice(0, length - truncation.length) + truncation : String(this);
  },

  strip: function() {
    return this.replace(/^\s+/, '').replace(/\s+$/, '');
  },

  stripTags: function() {
    return this.replace(/<\/?[^>]+>/gi, '');
  },

  stripScripts: function() {
    return this.replace(new RegExp(Prototype.ScriptFragment, 'img'), '');
  },

  extractScripts: function() {
    var matchAll = new RegExp(Prototype.ScriptFragment, 'img');
    var matchOne = new RegExp(Prototype.ScriptFragment, 'im');
    return (this.match(matchAll) || []).map(function(scriptTag) {
      return (scriptTag.match(matchOne) || ['', ''])[1];
    });
  },

  evalScripts: function() {
    return this.extractScripts().map(function(script) { return eval(script) });
  },

  escapeHTML: function() {
    var self = arguments.callee;
    self.text.data = this;
    return self.div.innerHTML;
  },

  unescapeHTML: function() {
    var div = new Element('div');
    div.innerHTML = this.stripTags();
    return div.childNodes[0] ? (div.childNodes.length > 1 ?
      $A(div.childNodes).inject('', function(memo, node) { return memo+node.nodeValue }) :
      div.childNodes[0].nodeValue) : '';
  },

  toQueryParams: function(separator) {
    var match = this.strip().match(/([^?#]*)(#.*)?$/);
    if (!match) return { };

    return match[1].split(separator || '&').inject({ }, function(hash, pair) {
      if ((pair = pair.split('='))[0]) {
        var key = decodeURIComponent(pair.shift());
        var value = pair.length > 1 ? pair.join('=') : pair[0];
        if (value != undefined) value = decodeURIComponent(value);

        if (key in hash) {
          if (!Object.isArray(hash[key])) hash[key] = [hash[key]];
          hash[key].push(value);
        }
        else hash[key] = value;
      }
      return hash;
    });
  },

  toArray: function() {
    return this.split('');
  },

  succ: function() {
    return this.slice(0, this.length - 1) +
      String.fromCharCode(this.charCodeAt(this.length - 1) + 1);
  },

  times: function(count) {
    return count < 1 ? '' : new Array(count + 1).join(this);
  },

  camelize: function() {
    var parts = this.split('-'), len = parts.length;
    if (len == 1) return parts[0];

    var camelized = this.charAt(0) == '-'
      ? parts[0].charAt(0).toUpperCase() + parts[0].substring(1)
      : parts[0];

    for (var i = 1; i < len; i++)
      camelized += parts[i].charAt(0).toUpperCase() + parts[i].substring(1);

    return camelized;
  },

  capitalize: function() {
    return this.charAt(0).toUpperCase() + this.substring(1).toLowerCase();
  },

  underscore: function() {
    return this.gsub(/::/, '/').gsub(/([A-Z]+)([A-Z][a-z])/,'#{1}_#{2}').gsub(/([a-z\d])([A-Z])/,'#{1}_#{2}').gsub(/-/,'_').toLowerCase();
  },

  dasherize: function() {
    return this.gsub(/_/,'-');
  },

  inspect: function(useDoubleQuotes) {
    var escapedString = this.gsub(/[\x00-\x1f\\]/, function(match) {
      var character = String.specialChar[match[0]];
      return character ? character : '\\u00' + match[0].charCodeAt().toPaddedString(2, 16);
    });
    if (useDoubleQuotes) return '"' + escapedString.replace(/"/g, '\\"') + '"';
    return "'" + escapedString.replace(/'/g, '\\\'') + "'";
  },

  toJSON: function() {
    return this.inspect(true);
  },

  unfilterJSON: function(filter) {
    return this.sub(filter || Prototype.JSONFilter, '#{1}');
  },

  isJSON: function() {
    var str = this;
    if (str.blank()) return false;
    str = this.replace(/\\./g, '@').replace(/"[^"\\\n\r]*"/g, '');
    return (/^[,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]*$/).test(str);
  },

  evalJSON: function(sanitize) {
    var json = this.unfilterJSON();
    try {
      if (!sanitize || json.isJSON()) return eval('(' + json + ')');
    } catch (e) { }
    throw new SyntaxError('Badly formed JSON string: ' + this.inspect());
  },

  include: function(pattern) {
    return this.indexOf(pattern) > -1;
  },

  startsWith: function(pattern) {
    return this.indexOf(pattern) === 0;
  },

  endsWith: function(pattern) {
    var d = this.length - pattern.length;
    return d >= 0 && this.lastIndexOf(pattern) === d;
  },

  empty: function() {
    return this == '';
  },

  blank: function() {
    return /^\s*$/.test(this);
  },

  interpolate: function(object, pattern) {
    return new Template(this, pattern).evaluate(object);
  }
});

if (Prototype.Browser.WebKit || Prototype.Browser.IE) Object.extend(String.prototype, {
  escapeHTML: function() {
    return this.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;');
  },
  unescapeHTML: function() {
    return this.replace(/&amp;/g,'&').replace(/&lt;/g,'<').replace(/&gt;/g,'>');
  }
});

String.prototype.gsub.prepareReplacement = function(replacement) {
  if (Object.isFunction(replacement)) return replacement;
  var template = new Template(replacement);
  return function(match) { return template.evaluate(match) };
};

String.prototype.parseQuery = String.prototype.toQueryParams;

Object.extend(String.prototype.escapeHTML, {
  div:  document.createElement('div'),
  text: document.createTextNode('')
});

with (String.prototype.escapeHTML) div.appendChild(text);

var Template = Class.create({
  initialize: function(template, pattern) {
    this.template = template.toString();
    this.pattern = pattern || Template.Pattern;
  },

  evaluate: function(object) {
    if (Object.isFunction(object.toTemplateReplacements))
      object = object.toTemplateReplacements();

    return this.template.gsub(this.pattern, function(match) {
      if (object == null) return '';

      var before = match[1] || '';
      if (before == '\\') return match[2];

      var ctx = object, expr = match[3];
      var pattern = /^([^.[]+|\[((?:.*?[^\\])?)\])(\.|\[|$)/;
      match = pattern.exec(expr);
      if (match == null) return before;

      while (match != null) {
        var comp = match[1].startsWith('[') ? match[2].gsub('\\\\]', ']') : match[1];
        ctx = ctx[comp];
        if (null == ctx || '' == match[3]) break;
        expr = expr.substring('[' == match[3] ? match[1].length : match[0].length);
        match = pattern.exec(expr);
      }

      return before + String.interpret(ctx);
    });
  }
});
Template.Pattern = /(^|.|\r|\n)(#\{(.*?)\})/;

var $break = { };

var Enumerable = {
  each: function(iterator, context) {
    var index = 0;
    iterator = iterator.bind(context);
    try {
      this._each(function(value) {
        iterator(value, index++);
      });
    } catch (e) {
      if (e != $break) throw e;
    }
    return this;
  },

  eachSlice: function(number, iterator, context) {
    iterator = iterator ? iterator.bind(context) : Prototype.K;
    var index = -number, slices = [], array = this.toArray();
    while ((index += number) < array.length)
      slices.push(array.slice(index, index+number));
    return slices.collect(iterator, context);
  },

  all: function(iterator, context) {
    iterator = iterator ? iterator.bind(context) : Prototype.K;
    var result = true;
    this.each(function(value, index) {
      result = result && !!iterator(value, index);
      if (!result) throw $break;
    });
    return result;
  },

  any: function(iterator, context) {
    iterator = iterator ? iterator.bind(context) : Prototype.K;
    var result = false;
    this.each(function(value, index) {
      if (result = !!iterator(value, index))
        throw $break;
    });
    return result;
  },

  collect: function(iterator, context) {
    iterator = iterator ? iterator.bind(context) : Prototype.K;
    var results = [];
    this.each(function(value, index) {
      results.push(iterator(value, index));
    });
    return results;
  },

  detect: function(iterator, context) {
    iterator = iterator.bind(context);
    var result;
    this.each(function(value, index) {
      if (iterator(value, index)) {
        result = value;
        throw $break;
      }
    });
    return result;
  },

  findAll: function(iterator, context) {
    iterator = iterator.bind(context);
    var results = [];
    this.each(function(value, index) {
      if (iterator(value, index))
        results.push(value);
    });
    return results;
  },

  grep: function(filter, iterator, context) {
    iterator = iterator ? iterator.bind(context) : Prototype.K;
    var results = [];

    if (Object.isString(filter))
      filter = new RegExp(filter);

    this.each(function(value, index) {
      if (filter.match(value))
        results.push(iterator(value, index));
    });
    return results;
  },

  include: function(object) {
    if (Object.isFunction(this.indexOf))
      if (this.indexOf(object) != -1) return true;

    var found = false;
    this.each(function(value) {
      if (value == object) {
        found = true;
        throw $break;
      }
    });
    return found;
  },

  inGroupsOf: function(number, fillWith) {
    fillWith = Object.isUndefined(fillWith) ? null : fillWith;
    return this.eachSlice(number, function(slice) {
      while(slice.length < number) slice.push(fillWith);
      return slice;
    });
  },

  inject: function(memo, iterator, context) {
    iterator = iterator.bind(context);
    this.each(function(value, index) {
      memo = iterator(memo, value, index);
    });
    return memo;
  },

  invoke: function(method) {
    var args = $A(arguments).slice(1);
    return this.map(function(value) {
      return value[method].apply(value, args);
    });
  },

  max: function(iterator, context) {
    iterator = iterator ? iterator.bind(context) : Prototype.K;
    var result;
    this.each(function(value, index) {
      value = iterator(value, index);
      if (result == null || value >= result)
        result = value;
    });
    return result;
  },

  min: function(iterator, context) {
    iterator = iterator ? iterator.bind(context) : Prototype.K;
    var result;
    this.each(function(value, index) {
      value = iterator(value, index);
      if (result == null || value < result)
        result = value;
    });
    return result;
  },

  partition: function(iterator, context) {
    iterator = iterator ? iterator.bind(context) : Prototype.K;
    var trues = [], falses = [];
    this.each(function(value, index) {
      (iterator(value, index) ?
        trues : falses).push(value);
    });
    return [trues, falses];
  },

  pluck: function(property) {
    var results = [];
    this.each(function(value) {
      results.push(value[property]);
    });
    return results;
  },

  reject: function(iterator, context) {
    iterator = iterator.bind(context);
    var results = [];
    this.each(function(value, index) {
      if (!iterator(value, index))
        results.push(value);
    });
    return results;
  },

  sortBy: function(iterator, context) {
    iterator = iterator.bind(context);
    return this.map(function(value, index) {
      return {value: value, criteria: iterator(value, index)};
    }).sort(function(left, right) {
      var a = left.criteria, b = right.criteria;
      return a < b ? -1 : a > b ? 1 : 0;
    }).pluck('value');
  },

  toArray: function() {
    return this.map();
  },

  zip: function() {
    var iterator = Prototype.K, args = $A(arguments);
    if (Object.isFunction(args.last()))
      iterator = args.pop();

    var collections = [this].concat(args).map($A);
    return this.map(function(value, index) {
      return iterator(collections.pluck(index));
    });
  },

  size: function() {
    return this.toArray().length;
  },

  inspect: function() {
    return '#<Enumerable:' + this.toArray().inspect() + '>';
  }
};

Object.extend(Enumerable, {
  map:     Enumerable.collect,
  find:    Enumerable.detect,
  select:  Enumerable.findAll,
  filter:  Enumerable.findAll,
  member:  Enumerable.include,
  entries: Enumerable.toArray,
  every:   Enumerable.all,
  some:    Enumerable.any
});
function $A(iterable) {
  if (!iterable) return [];
  if (iterable.toArray) return iterable.toArray();
  var length = iterable.length || 0, results = new Array(length);
  while (length--) results[length] = iterable[length];
  return results;
}

if (Prototype.Browser.WebKit) {
  $A = function(iterable) {
    if (!iterable) return [];
    if (!(Object.isFunction(iterable) && iterable == '[object NodeList]') &&
        iterable.toArray) return iterable.toArray();
    var length = iterable.length || 0, results = new Array(length);
    while (length--) results[length] = iterable[length];
    return results;
  };
}

Array.from = $A;

Object.extend(Array.prototype, Enumerable);

if (!Array.prototype._reverse) Array.prototype._reverse = Array.prototype.reverse;

Object.extend(Array.prototype, {
  _each: function(iterator) {
    for (var i = 0, length = this.length; i < length; i++)
      iterator(this[i]);
  },

  clear: function() {
    this.length = 0;
    return this;
  },

  first: function() {
    return this[0];
  },

  last: function() {
    return this[this.length - 1];
  },

  compact: function() {
    return this.select(function(value) {
      return value != null;
    });
  },

  flatten: function() {
    return this.inject([], function(array, value) {
      return array.concat(Object.isArray(value) ?
        value.flatten() : [value]);
    });
  },

  without: function() {
    var values = $A(arguments);
    return this.select(function(value) {
      return !values.include(value);
    });
  },

  reverse: function(inline) {
    return (inline !== false ? this : this.toArray())._reverse();
  },

  reduce: function() {
    return this.length > 1 ? this : this[0];
  },

  uniq: function(sorted) {
    return this.inject([], function(array, value, index) {
      if (0 == index || (sorted ? array.last() != value : !array.include(value)))
        array.push(value);
      return array;
    });
  },

  intersect: function(array) {
    return this.uniq().findAll(function(item) {
      return array.detect(function(value) { return item === value });
    });
  },

  clone: function() {
    return [].concat(this);
  },

  size: function() {
    return this.length;
  },

  inspect: function() {
    return '[' + this.map(Object.inspect).join(', ') + ']';
  },

  toJSON: function() {
    var results = [];
    this.each(function(object) {
      var value = Object.toJSON(object);
      if (!Object.isUndefined(value)) results.push(value);
    });
    return '[' + results.join(', ') + ']';
  }
});

// use native browser JS 1.6 implementation if available
if (Object.isFunction(Array.prototype.forEach))
  Array.prototype._each = Array.prototype.forEach;

if (!Array.prototype.indexOf) Array.prototype.indexOf = function(item, i) {
  i || (i = 0);
  var length = this.length;
  if (i < 0) i = length + i;
  for (; i < length; i++)
    if (this[i] === item) return i;
  return -1;
};

if (!Array.prototype.lastIndexOf) Array.prototype.lastIndexOf = function(item, i) {
  i = isNaN(i) ? this.length : (i < 0 ? this.length + i : i) + 1;
  var n = this.slice(0, i).reverse().indexOf(item);
  return (n < 0) ? n : i - n - 1;
};

Array.prototype.toArray = Array.prototype.clone;

function $w(string) {
  if (!Object.isString(string)) return [];
  string = string.strip();
  return string ? string.split(/\s+/) : [];
}

if (Prototype.Browser.Opera){
  Array.prototype.concat = function() {
    var array = [];
    for (var i = 0, length = this.length; i < length; i++) array.push(this[i]);
    for (var i = 0, length = arguments.length; i < length; i++) {
      if (Object.isArray(arguments[i])) {
        for (var j = 0, arrayLength = arguments[i].length; j < arrayLength; j++)
          array.push(arguments[i][j]);
      } else {
        array.push(arguments[i]);
      }
    }
    return array;
  };
}
Object.extend(Number.prototype, {
  toColorPart: function() {
    return this.toPaddedString(2, 16);
  },

  succ: function() {
    return this + 1;
  },

  times: function(iterator) {
    $R(0, this, true).each(iterator);
    return this;
  },

  toPaddedString: function(length, radix) {
    var string = this.toString(radix || 10);
    return '0'.times(length - string.length) + string;
  },

  toJSON: function() {
    return isFinite(this) ? this.toString() : 'null';
  }
});

$w('abs round ceil floor').each(function(method){
  Number.prototype[method] = Math[method].methodize();
});
function $H(object) {
  return new Hash(object);
};

var Hash = Class.create(Enumerable, (function() {

  function toQueryPair(key, value) {
    if (Object.isUndefined(value)) return key;
    return key + '=' + encodeURIComponent(String.interpret(value));
  }

  return {
    initialize: function(object) {
      this._object = Object.isHash(object) ? object.toObject() : Object.clone(object);
    },

    _each: function(iterator) {
      for (var key in this._object) {
        var value = this._object[key], pair = [key, value];
        pair.key = key;
        pair.value = value;
        iterator(pair);
      }
    },

    set: function(key, value) {
      return this._object[key] = value;
    },

    get: function(key) {
      return this._object[key];
    },

    unset: function(key) {
      var value = this._object[key];
      delete this._object[key];
      return value;
    },

    toObject: function() {
      return Object.clone(this._object);
    },

    keys: function() {
      return this.pluck('key');
    },

    values: function() {
      return this.pluck('value');
    },

    index: function(value) {
      var match = this.detect(function(pair) {
        return pair.value === value;
      });
      return match && match.key;
    },

    merge: function(object) {
      return this.clone().update(object);
    },

    update: function(object) {
      return new Hash(object).inject(this, function(result, pair) {
        result.set(pair.key, pair.value);
        return result;
      });
    },

    toQueryString: function() {
      return this.map(function(pair) {
        var key = encodeURIComponent(pair.key), values = pair.value;

        if (values && typeof values == 'object') {
          if (Object.isArray(values))
            return values.map(toQueryPair.curry(key)).join('&');
        }
        return toQueryPair(key, values);
      }).join('&');
    },

    inspect: function() {
      return '#<Hash:{' + this.map(function(pair) {
        return pair.map(Object.inspect).join(': ');
      }).join(', ') + '}>';
    },

    toJSON: function() {
      return Object.toJSON(this.toObject());
    },

    clone: function() {
      return new Hash(this);
    }
  }
})());

Hash.prototype.toTemplateReplacements = Hash.prototype.toObject;
Hash.from = $H;
var ObjectRange = Class.create(Enumerable, {
  initialize: function(start, end, exclusive) {
    this.start = start;
    this.end = end;
    this.exclusive = exclusive;
  },

  _each: function(iterator) {
    var value = this.start;
    while (this.include(value)) {
      iterator(value);
      value = value.succ();
    }
  },

  include: function(value) {
    if (value < this.start)
      return false;
    if (this.exclusive)
      return value < this.end;
    return value <= this.end;
  }
});

var $R = function(start, end, exclusive) {
  return new ObjectRange(start, end, exclusive);
};

var Ajax = {
  getTransport: function() {
    return Try.these(
      function() {return new XMLHttpRequest()},
      function() {return new ActiveXObject('Msxml2.XMLHTTP')},
      function() {return new ActiveXObject('Microsoft.XMLHTTP')}
    ) || false;
  },

  activeRequestCount: 0
};

Ajax.Responders = {
  responders: [],

  _each: function(iterator) {
    this.responders._each(iterator);
  },

  register: function(responder) {
    if (!this.include(responder))
      this.responders.push(responder);
  },

  unregister: function(responder) {
    this.responders = this.responders.without(responder);
  },

  dispatch: function(callback, request, transport, json) {
    this.each(function(responder) {
      if (Object.isFunction(responder[callback])) {
        try {
          responder[callback].apply(responder, [request, transport, json]);
        } catch (e) { }
      }
    });
  }
};

Object.extend(Ajax.Responders, Enumerable);

Ajax.Responders.register({
  onCreate:   function() { Ajax.activeRequestCount++ },
  onComplete: function() { Ajax.activeRequestCount-- }
});

Ajax.Base = Class.create({
  initialize: function(options) {
    this.options = {
      method:       'post',
      asynchronous: true,
      contentType:  'application/x-www-form-urlencoded',
      encoding:     'UTF-8',
      parameters:   '',
      evalJSON:     true,
      evalJS:       true
    };
    Object.extend(this.options, options || { });

    this.options.method = this.options.method.toLowerCase();

    if (Object.isString(this.options.parameters))
      this.options.parameters = this.options.parameters.toQueryParams();
    else if (Object.isHash(this.options.parameters))
      this.options.parameters = this.options.parameters.toObject();
  }
});

Ajax.Request = Class.create(Ajax.Base, {
  _complete: false,

  initialize: function($super, url, options) {
    $super(options);
    this.transport = Ajax.getTransport();
    this.request(url);
  },

  request: function(url) {
    this.url = url;
    this.method = this.options.method;
    var params = Object.clone(this.options.parameters);

    if (!['get', 'post'].include(this.method)) {
      // simulate other verbs over post
      params['_method'] = this.method;
      this.method = 'post';
    }

    this.parameters = params;

    if (params = Object.toQueryString(params)) {
      // when GET, append parameters to URL
      if (this.method == 'get')
        this.url += (this.url.include('?') ? '&' : '?') + params;
      else if (/Konqueror|Safari|KHTML/.test(navigator.userAgent))
        params += '&_=';
    }

    try {
      var response = new Ajax.Response(this);
      if (this.options.onCreate) this.options.onCreate(response);
      Ajax.Responders.dispatch('onCreate', this, response);

      this.transport.open(this.method.toUpperCase(), this.url,
        this.options.asynchronous);

      if (this.options.asynchronous) this.respondToReadyState.bind(this).defer(1);

      this.transport.onreadystatechange = this.onStateChange.bind(this);
      this.setRequestHeaders();

      this.body = this.method == 'post' ? (this.options.postBody || params) : null;
      this.transport.send(this.body);

      /* Force Firefox to handle ready state 4 for synchronous requests */
      if (!this.options.asynchronous && this.transport.overrideMimeType)
        this.onStateChange();

    }
    catch (e) {
      this.dispatchException(e);
    }
  },

  onStateChange: function() {
    var readyState = this.transport.readyState;
    if (readyState > 1 && !((readyState == 4) && this._complete))
      this.respondToReadyState(this.transport.readyState);
  },

  setRequestHeaders: function() {
    var headers = {
      'X-Requested-With': 'XMLHttpRequest',
      'X-Prototype-Version': Prototype.Version,
      'Accept': 'text/javascript, text/html, application/xml, text/xml, */*'
    };

    if (this.method == 'post') {
      headers['Content-type'] = this.options.contentType +
        (this.options.encoding ? '; charset=' + this.options.encoding : '');

      /* Force "Connection: close" for older Mozilla browsers to work
       * around a bug where XMLHttpRequest sends an incorrect
       * Content-length header. See Mozilla Bugzilla #246651.
       */
      if (this.transport.overrideMimeType &&
          (navigator.userAgent.match(/Gecko\/(\d{4})/) || [0,2005])[1] < 2005)
            headers['Connection'] = 'close';
    }

    // user-defined headers
    if (typeof this.options.requestHeaders == 'object') {
      var extras = this.options.requestHeaders;

      if (Object.isFunction(extras.push))
        for (var i = 0, length = extras.length; i < length; i += 2)
          headers[extras[i]] = extras[i+1];
      else
        $H(extras).each(function(pair) { headers[pair.key] = pair.value });
    }

    for (var name in headers)
      this.transport.setRequestHeader(name, headers[name]);
  },

  success: function() {
    var status = this.getStatus();
    return !status || (status >= 200 && status < 300);
  },

  getStatus: function() {
    try {
      return this.transport.status || 0;
    } catch (e) { return 0 }
  },

  respondToReadyState: function(readyState) {
    var state = Ajax.Request.Events[readyState], response = new Ajax.Response(this);

    if (state == 'Complete') {
      try {
        this._complete = true;
        (this.options['on' + response.status]
         || this.options['on' + (this.success() ? 'Success' : 'Failure')]
         || Prototype.emptyFunction)(response, response.headerJSON);
      } catch (e) {
        this.dispatchException(e);
      }

      var contentType = response.getHeader('Content-type');
      if (this.options.evalJS == 'force'
          || (this.options.evalJS && this.isSameOrigin() && contentType
          && contentType.match(/^\s*(text|application)\/(x-)?(java|ecma)script(;.*)?\s*$/i)))
        this.evalResponse();
    }

    try {
      (this.options['on' + state] || Prototype.emptyFunction)(response, response.headerJSON);
      Ajax.Responders.dispatch('on' + state, this, response, response.headerJSON);
    } catch (e) {
      this.dispatchException(e);
    }

    if (state == 'Complete') {
      // avoid memory leak in MSIE: clean up
      this.transport.onreadystatechange = Prototype.emptyFunction;
    }
  },

  isSameOrigin: function() {
    var m = this.url.match(/^\s*https?:\/\/[^\/]*/);
    return !m || (m[0] == '#{protocol}//#{domain}#{port}'.interpolate({
      protocol: location.protocol,
      domain: document.domain,
      port: location.port ? ':' + location.port : ''
    }));
  },

  getHeader: function(name) {
    try {
      return this.transport.getResponseHeader(name) || null;
    } catch (e) { return null }
  },

  evalResponse: function() {
    try {
      return eval((this.transport.responseText || '').unfilterJSON());
    } catch (e) {
      this.dispatchException(e);
    }
  },

  dispatchException: function(exception) {
    (this.options.onException || Prototype.emptyFunction)(this, exception);
    Ajax.Responders.dispatch('onException', this, exception);
  }
});

Ajax.Request.Events =
  ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];

Ajax.Response = Class.create({
  initialize: function(request){
    this.request = request;
    var transport  = this.transport  = request.transport,
        readyState = this.readyState = transport.readyState;

    if((readyState > 2 && !Prototype.Browser.IE) || readyState == 4) {
      this.status       = this.getStatus();
      this.statusText   = this.getStatusText();
      this.responseText = String.interpret(transport.responseText);
      this.headerJSON   = this._getHeaderJSON();
    }

    if(readyState == 4) {
      var xml = transport.responseXML;
      this.responseXML  = Object.isUndefined(xml) ? null : xml;
      this.responseJSON = this._getResponseJSON();
    }
  },

  status:      0,
  statusText: '',

  getStatus: Ajax.Request.prototype.getStatus,

  getStatusText: function() {
    try {
      return this.transport.statusText || '';
    } catch (e) { return '' }
  },

  getHeader: Ajax.Request.prototype.getHeader,

  getAllHeaders: function() {
    try {
      return this.getAllResponseHeaders();
    } catch (e) { return null }
  },

  getResponseHeader: function(name) {
    return this.transport.getResponseHeader(name);
  },

  getAllResponseHeaders: function() {
    return this.transport.getAllResponseHeaders();
  },

  _getHeaderJSON: function() {
    var json = this.getHeader('X-JSON');
    if (!json) return null;
    json = decodeURIComponent(escape(json));
    try {
      return json.evalJSON(this.request.options.sanitizeJSON ||
        !this.request.isSameOrigin());
    } catch (e) {
      this.request.dispatchException(e);
    }
  },

  _getResponseJSON: function() {
    var options = this.request.options;
    if (!options.evalJSON || (options.evalJSON != 'force' &&
      !(this.getHeader('Content-type') || '').include('application/json')) ||
        this.responseText.blank())
          return null;
    try {
      return this.responseText.evalJSON(options.sanitizeJSON ||
        !this.request.isSameOrigin());
    } catch (e) {
      this.request.dispatchException(e);
    }
  }
});

Ajax.Updater = Class.create(Ajax.Request, {
  initialize: function($super, container, url, options) {
    this.container = {
      success: (container.success || container),
      failure: (container.failure || (container.success ? null : container))
    };

    options = Object.clone(options);
    var onComplete = options.onComplete;
    options.onComplete = (function(response, json) {
      this.updateContent(response.responseText);
      if (Object.isFunction(onComplete)) onComplete(response, json);
    }).bind(this);

    $super(url, options);
  },

  updateContent: function(responseText) {
    var receiver = this.container[this.success() ? 'success' : 'failure'],
        options = this.options;

    if (!options.evalScripts) responseText = responseText.stripScripts();

    if (receiver = $(receiver)) {
      if (options.insertion) {
        if (Object.isString(options.insertion)) {
          var insertion = { }; insertion[options.insertion] = responseText;
          receiver.insert(insertion);
        }
        else options.insertion(receiver, responseText);
      }
      else receiver.update(responseText);
    }
  }
});

Ajax.PeriodicalUpdater = Class.create(Ajax.Base, {
  initialize: function($super, container, url, options) {
    $super(options);
    this.onComplete = this.options.onComplete;

    this.frequency = (this.options.frequency || 2);
    this.decay = (this.options.decay || 1);

    this.updater = { };
    this.container = container;
    this.url = url;

    this.start();
  },

  start: function() {
    this.options.onComplete = this.updateComplete.bind(this);
    this.onTimerEvent();
  },

  stop: function() {
    this.updater.options.onComplete = undefined;
    clearTimeout(this.timer);
    (this.onComplete || Prototype.emptyFunction).apply(this, arguments);
  },

  updateComplete: function(response) {
    if (this.options.decay) {
      this.decay = (response.responseText == this.lastText ?
        this.decay * this.options.decay : 1);

      this.lastText = response.responseText;
    }
    this.timer = this.onTimerEvent.bind(this).delay(this.decay * this.frequency);
  },

  onTimerEvent: function() {
    this.updater = new Ajax.Updater(this.container, this.url, this.options);
  }
});
function $(element) {
  if (arguments.length > 1) {
    for (var i = 0, elements = [], length = arguments.length; i < length; i++)
      elements.push($(arguments[i]));
    return elements;
  }
  if (Object.isString(element))
    element = document.getElementById(element);
  return Element.extend(element);
}

if (Prototype.BrowserFeatures.XPath) {
  document._getElementsByXPath = function(expression, parentElement) {
    var results = [];
    var query = document.evaluate(expression, $(parentElement) || document,
      null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
    for (var i = 0, length = query.snapshotLength; i < length; i++)
      results.push(Element.extend(query.snapshotItem(i)));
    return results;
  };
}

/*--------------------------------------------------------------------------*/

if (!window.Node) var Node = { };

if (!Node.ELEMENT_NODE) {
  // DOM level 2 ECMAScript Language Binding
  Object.extend(Node, {
    ELEMENT_NODE: 1,
    ATTRIBUTE_NODE: 2,
    TEXT_NODE: 3,
    CDATA_SECTION_NODE: 4,
    ENTITY_REFERENCE_NODE: 5,
    ENTITY_NODE: 6,
    PROCESSING_INSTRUCTION_NODE: 7,
    COMMENT_NODE: 8,
    DOCUMENT_NODE: 9,
    DOCUMENT_TYPE_NODE: 10,
    DOCUMENT_FRAGMENT_NODE: 11,
    NOTATION_NODE: 12
  });
}

(function() {
  var element = this.Element;
  this.Element = function(tagName, attributes) {
    attributes = attributes || { };
    tagName = tagName.toLowerCase();
    var cache = Element.cache;
    if (Prototype.Browser.IE && attributes.name) {
      tagName = '<' + tagName + ' name="' + attributes.name + '">';
      delete attributes.name;
      return Element.writeAttribute(document.createElement(tagName), attributes);
    }
    if (!cache[tagName]) cache[tagName] = Element.extend(document.createElement(tagName));
    return Element.writeAttribute(cache[tagName].cloneNode(false), attributes);
  };
  Object.extend(this.Element, element || { });
}).call(window);

Element.cache = { };

Element.Methods = {
  visible: function(element) {
    return $(element).style.display != 'none';
  },

  toggle: function(element) {
    element = $(element);
    Element[Element.visible(element) ? 'hide' : 'show'](element);
    return element;
  },

  hide: function(element) {
    $(element).style.display = 'none';
    return element;
  },

  show: function(element) {
    $(element).style.display = '';
    return element;
  },

  remove: function(element) {
    element = $(element);
    element.parentNode.removeChild(element);
    return element;
  },

  update: function(element, content) {
    element = $(element);
    if (content && content.toElement) content = content.toElement();
    if (Object.isElement(content)) return element.update().insert(content);
    content = Object.toHTML(content);
    element.innerHTML = content.stripScripts();
    content.evalScripts.bind(content).defer();
    return element;
  },

  replace: function(element, content) {
    element = $(element);
    if (content && content.toElement) content = content.toElement();
    else if (!Object.isElement(content)) {
      content = Object.toHTML(content);
      var range = element.ownerDocument.createRange();
      range.selectNode(element);
      content.evalScripts.bind(content).defer();
      content = range.createContextualFragment(content.stripScripts());
    }
    element.parentNode.replaceChild(content, element);
    return element;
  },

  insert: function(element, insertions) {
    element = $(element);

    if (Object.isString(insertions) || Object.isNumber(insertions) ||
        Object.isElement(insertions) || (insertions && (insertions.toElement || insertions.toHTML)))
          insertions = {bottom:insertions};

    var content, insert, tagName, childNodes;

    for (var position in insertions) {
      content  = insertions[position];
      position = position.toLowerCase();
      insert = Element._insertionTranslations[position];

      if (content && content.toElement) content = content.toElement();
      if (Object.isElement(content)) {
        insert(element, content);
        continue;
      }

      content = Object.toHTML(content);

      tagName = ((position == 'before' || position == 'after')
        ? element.parentNode : element).tagName.toUpperCase();

      childNodes = Element._getContentFromAnonymousElement(tagName, content.stripScripts());

      if (position == 'top' || position == 'after') childNodes.reverse();
      childNodes.each(insert.curry(element));

      content.evalScripts.bind(content).defer();
    }

    return element;
  },

  wrap: function(element, wrapper, attributes) {
    element = $(element);
    if (Object.isElement(wrapper))
      $(wrapper).writeAttribute(attributes || { });
    else if (Object.isString(wrapper)) wrapper = new Element(wrapper, attributes);
    else wrapper = new Element('div', wrapper);
    if (element.parentNode)
      element.parentNode.replaceChild(wrapper, element);
    wrapper.appendChild(element);
    return wrapper;
  },

  inspect: function(element) {
    element = $(element);
    var result = '<' + element.tagName.toLowerCase();
    $H({'id': 'id', 'className': 'class'}).each(function(pair) {
      var property = pair.first(), attribute = pair.last();
      var value = (element[property] || '').toString();
      if (value) result += ' ' + attribute + '=' + value.inspect(true);
    });
    return result + '>';
  },

  recursivelyCollect: function(element, property) {
    element = $(element);
    var elements = [];
    while (element = element[property])
      if (element.nodeType == 1)
        elements.push(Element.extend(element));
    return elements;
  },

  ancestors: function(element) {
    return $(element).recursivelyCollect('parentNode');
  },

  descendants: function(element) {
    return $(element).select("*");
  },

  firstDescendant: function(element) {
    element = $(element).firstChild;
    while (element && element.nodeType != 1) element = element.nextSibling;
    return $(element);
  },

  immediateDescendants: function(element) {
    if (!(element = $(element).firstChild)) return [];
    while (element && element.nodeType != 1) element = element.nextSibling;
    if (element) return [element].concat($(element).nextSiblings());
    return [];
  },

  previousSiblings: function(element) {
    return $(element).recursivelyCollect('previousSibling');
  },

  nextSiblings: function(element) {
    return $(element).recursivelyCollect('nextSibling');
  },

  siblings: function(element) {
    element = $(element);
    return element.previousSiblings().reverse().concat(element.nextSiblings());
  },

  match: function(element, selector) {
    if (Object.isString(selector))
      selector = new Selector(selector);
    return selector.match($(element));
  },

  up: function(element, expression, index) {
    element = $(element);
    if (arguments.length == 1) return $(element.parentNode);
    var ancestors = element.ancestors();
    return Object.isNumber(expression) ? ancestors[expression] :
      Selector.findElement(ancestors, expression, index);
  },

  down: function(element, expression, index) {
    element = $(element);
    if (arguments.length == 1) return element.firstDescendant();
    return Object.isNumber(expression) ? element.descendants()[expression] :
      element.select(expression)[index || 0];
  },

  previous: function(element, expression, index) {
    element = $(element);
    if (arguments.length == 1) return $(Selector.handlers.previousElementSibling(element));
    var previousSiblings = element.previousSiblings();
    return Object.isNumber(expression) ? previousSiblings[expression] :
      Selector.findElement(previousSiblings, expression, index);
  },

  next: function(element, expression, index) {
    element = $(element);
    if (arguments.length == 1) return $(Selector.handlers.nextElementSibling(element));
    var nextSiblings = element.nextSiblings();
    return Object.isNumber(expression) ? nextSiblings[expression] :
      Selector.findElement(nextSiblings, expression, index);
  },

  select: function() {
    var args = $A(arguments), element = $(args.shift());
    return Selector.findChildElements(element, args);
  },

  adjacent: function() {
    var args = $A(arguments), element = $(args.shift());
    return Selector.findChildElements(element.parentNode, args).without(element);
  },

  identify: function(element) {
    element = $(element);
    var id = element.readAttribute('id'), self = arguments.callee;
    if (id) return id;
    do { id = 'anonymous_element_' + self.counter++ } while ($(id));
    element.writeAttribute('id', id);
    return id;
  },

  readAttribute: function(element, name) {
    element = $(element);
    if (Prototype.Browser.IE) {
      var t = Element._attributeTranslations.read;
      if (t.values[name]) return t.values[name](element, name);
      if (t.names[name]) name = t.names[name];
      if (name.include(':')) {
        return (!element.attributes || !element.attributes[name]) ? null :
         element.attributes[name].value;
      }
    }
    return element.getAttribute(name);
  },

  writeAttribute: function(element, name, value) {
    element = $(element);
    var attributes = { }, t = Element._attributeTranslations.write;

    if (typeof name == 'object') attributes = name;
    else attributes[name] = Object.isUndefined(value) ? true : value;

    for (var attr in attributes) {
      name = t.names[attr] || attr;
      value = attributes[attr];
      if (t.values[attr]) name = t.values[attr](element, value);
      if (value === false || value === null)
        element.removeAttribute(name);
      else if (value === true)
        element.setAttribute(name, name);
      else element.setAttribute(name, value);
    }
    return element;
  },

  getHeight: function(element) {
    return $(element).getDimensions().height;
  },

  getWidth: function(element) {
    return $(element).getDimensions().width;
  },

  classNames: function(element) {
    return new Element.ClassNames(element);
  },

  hasClassName: function(element, className) {
    if (!(element = $(element))) return;
    var elementClassName = element.className;
    return (elementClassName.length > 0 && (elementClassName == className ||
      new RegExp("(^|\\s)" + className + "(\\s|$)").test(elementClassName)));
  },

  addClassName: function(element, className) {
    if (!(element = $(element))) return;
    if (!element.hasClassName(className))
      element.className += (element.className ? ' ' : '') + className;
    return element;
  },

  removeClassName: function(element, className) {
    if (!(element = $(element))) return;
    element.className = element.className.replace(
      new RegExp("(^|\\s+)" + className + "(\\s+|$)"), ' ').strip();
    return element;
  },

  toggleClassName: function(element, className) {
    if (!(element = $(element))) return;
    return element[element.hasClassName(className) ?
      'removeClassName' : 'addClassName'](className);
  },

  // removes whitespace-only text node children
  cleanWhitespace: function(element) {
    element = $(element);
    var node = element.firstChild;
    while (node) {
      var nextNode = node.nextSibling;
      if (node.nodeType == 3 && !/\S/.test(node.nodeValue))
        element.removeChild(node);
      node = nextNode;
    }
    return element;
  },

  empty: function(element) {
    return $(element).innerHTML.blank();
  },

  descendantOf: function(element, ancestor) {
    element = $(element), ancestor = $(ancestor);
    var originalAncestor = ancestor;

    if (element.compareDocumentPosition)
      return (element.compareDocumentPosition(ancestor) & 8) === 8;

    if (element.sourceIndex && !Prototype.Browser.Opera) {
      var e = element.sourceIndex, a = ancestor.sourceIndex,
       nextAncestor = ancestor.nextSibling;
      if (!nextAncestor) {
        do { ancestor = ancestor.parentNode; }
        while (!(nextAncestor = ancestor.nextSibling) && ancestor.parentNode);
      }
      if (nextAncestor && nextAncestor.sourceIndex)
       return (e > a && e < nextAncestor.sourceIndex);
    }

    while (element = element.parentNode)
      if (element == originalAncestor) return true;
    return false;
  },

  scrollTo: function(element) {
    element = $(element);
    var pos = element.cumulativeOffset();
    window.scrollTo(pos[0], pos[1]);
    return element;
  },

  getStyle: function(element, style) {
    element = $(element);
    style = style == 'float' ? 'cssFloat' : style.camelize();
    var value = element.style[style];
    if (!value) {
      var css = document.defaultView.getComputedStyle(element, null);
      value = css ? css[style] : null;
    }
    if (style == 'opacity') return value ? parseFloat(value) : 1.0;
    return value == 'auto' ? null : value;
  },

  getOpacity: function(element) {
    return $(element).getStyle('opacity');
  },

  setStyle: function(element, styles) {
    element = $(element);
    var elementStyle = element.style, match;
    if (Object.isString(styles)) {
      element.style.cssText += ';' + styles;
      return styles.include('opacity') ?
        element.setOpacity(styles.match(/opacity:\s*(\d?\.?\d*)/)[1]) : element;
    }
    for (var property in styles)
      if (property == 'opacity') element.setOpacity(styles[property]);
      else
        elementStyle[(property == 'float' || property == 'cssFloat') ?
          (Object.isUndefined(elementStyle.styleFloat) ? 'cssFloat' : 'styleFloat') :
            property] = styles[property];

    return element;
  },

  setOpacity: function(element, value) {
    element = $(element);
    element.style.opacity = (value == 1 || value === '') ? '' :
      (value < 0.00001) ? 0 : value;
    return element;
  },

  getDimensions: function(element) {
    element = $(element);
    var display = $(element).getStyle('display');
    if (display != 'none' && display != null) // Safari bug
      return {width: element.offsetWidth, height: element.offsetHeight};

    // All *Width and *Height properties give 0 on elements with display none,
    // so enable the element temporarily
    var els = element.style;
    var originalVisibility = els.visibility;
    var originalPosition = els.position;
    var originalDisplay = els.display;
    els.visibility = 'hidden';
    els.position = 'absolute';
    els.display = 'block';
    var originalWidth = element.clientWidth;
    var originalHeight = element.clientHeight;
    els.display = originalDisplay;
    els.position = originalPosition;
    els.visibility = originalVisibility;
    return {width: originalWidth, height: originalHeight};
  },

  makePositioned: function(element) {
    element = $(element);
    var pos = Element.getStyle(element, 'position');
    if (pos == 'static' || !pos) {
      element._madePositioned = true;
      element.style.position = 'relative';
      // Opera returns the offset relative to the positioning context, when an
      // element is position relative but top and left have not been defined
      if (window.opera) {
        element.style.top = 0;
        element.style.left = 0;
      }
    }
    return element;
  },

  undoPositioned: function(element) {
    element = $(element);
    if (element._madePositioned) {
      element._madePositioned = undefined;
      element.style.position =
        element.style.top =
        element.style.left =
        element.style.bottom =
        element.style.right = '';
    }
    return element;
  },

  makeClipping: function(element) {
    element = $(element);
    if (element._overflow) return element;
    element._overflow = Element.getStyle(element, 'overflow') || 'auto';
    if (element._overflow !== 'hidden')
      element.style.overflow = 'hidden';
    return element;
  },

  undoClipping: function(element) {
    element = $(element);
    if (!element._overflow) return element;
    element.style.overflow = element._overflow == 'auto' ? '' : element._overflow;
    element._overflow = null;
    return element;
  },

  cumulativeOffset: function(element) {
    var valueT = 0, valueL = 0;
    do {
      valueT += element.offsetTop  || 0;
      valueL += element.offsetLeft || 0;
      element = element.offsetParent;
    } while (element);
    return Element._returnOffset(valueL, valueT);
  },

  positionedOffset: function(element) {
    var valueT = 0, valueL = 0;
    do {
      valueT += element.offsetTop  || 0;
      valueL += element.offsetLeft || 0;
      element = element.offsetParent;
      if (element) {
        if (element.tagName == 'BODY') break;
        var p = Element.getStyle(element, 'position');
        if (p !== 'static') break;
      }
    } while (element);
    return Element._returnOffset(valueL, valueT);
  },

  absolutize: function(element) {
    element = $(element);
    if (element.getStyle('position') == 'absolute') return;
    // Position.prepare(); // To be done manually by Scripty when it needs it.

    var offsets = element.positionedOffset();
    var top     = offsets[1];
    var left    = offsets[0];
    var width   = element.clientWidth;
    var height  = element.clientHeight;

    element._originalLeft   = left - parseFloat(element.style.left  || 0);
    element._originalTop    = top  - parseFloat(element.style.top || 0);
    element._originalWidth  = element.style.width;
    element._originalHeight = element.style.height;

    element.style.position = 'absolute';
    element.style.top    = top + 'px';
    element.style.left   = left + 'px';
    element.style.width  = width + 'px';
    element.style.height = height + 'px';
    return element;
  },

  relativize: function(element) {
    element = $(element);
    if (element.getStyle('position') == 'relative') return;
    // Position.prepare(); // To be done manually by Scripty when it needs it.

    element.style.position = 'relative';
    var top  = parseFloat(element.style.top  || 0) - (element._originalTop || 0);
    var left = parseFloat(element.style.left || 0) - (element._originalLeft || 0);

    element.style.top    = top + 'px';
    element.style.left   = left + 'px';
    element.style.height = element._originalHeight;
    element.style.width  = element._originalWidth;
    return element;
  },

  cumulativeScrollOffset: function(element) {
    var valueT = 0, valueL = 0;
    do {
      valueT += element.scrollTop  || 0;
      valueL += element.scrollLeft || 0;
      element = element.parentNode;
    } while (element);
    return Element._returnOffset(valueL, valueT);
  },

  getOffsetParent: function(element) {
    if (element.offsetParent) return $(element.offsetParent);
    if (element == document.body) return $(element);

    while ((element = element.parentNode) && element != document.body)
      if (Element.getStyle(element, 'position') != 'static')
        return $(element);

    return $(document.body);
  },

  viewportOffset: function(forElement) {
    var valueT = 0, valueL = 0;

    var element = forElement;
    do {
      valueT += element.offsetTop  || 0;
      valueL += element.offsetLeft || 0;

      // Safari fix
      if (element.offsetParent == document.body &&
        Element.getStyle(element, 'position') == 'absolute') break;

    } while (element = element.offsetParent);

    element = forElement;
    do {
      if (!Prototype.Browser.Opera || element.tagName == 'BODY') {
        valueT -= element.scrollTop  || 0;
        valueL -= element.scrollLeft || 0;
      }
    } while (element = element.parentNode);

    return Element._returnOffset(valueL, valueT);
  },

  clonePosition: function(element, source) {
    var options = Object.extend({
      setLeft:    true,
      setTop:     true,
      setWidth:   true,
      setHeight:  true,
      offsetTop:  0,
      offsetLeft: 0
    }, arguments[2] || { });

    // find page position of source
    source = $(source);
    var p = source.viewportOffset();

    // find coordinate system to use
    element = $(element);
    var delta = [0, 0];
    var parent = null;
    // delta [0,0] will do fine with position: fixed elements,
    // position:absolute needs offsetParent deltas
    if (Element.getStyle(element, 'position') == 'absolute') {
      parent = element.getOffsetParent();
      delta = parent.viewportOffset();
    }

    // correct by body offsets (fixes Safari)
    if (parent == document.body) {
      delta[0] -= document.body.offsetLeft;
      delta[1] -= document.body.offsetTop;
    }

    // set position
    if (options.setLeft)   element.style.left  = (p[0] - delta[0] + options.offsetLeft) + 'px';
    if (options.setTop)    element.style.top   = (p[1] - delta[1] + options.offsetTop) + 'px';
    if (options.setWidth)  element.style.width = source.offsetWidth + 'px';
    if (options.setHeight) element.style.height = source.offsetHeight + 'px';
    return element;
  }
};

Element.Methods.identify.counter = 1;

Object.extend(Element.Methods, {
  getElementsBySelector: Element.Methods.select,
  childElements: Element.Methods.immediateDescendants
});

Element._attributeTranslations = {
  write: {
    names: {
      className: 'class',
      htmlFor:   'for'
    },
    values: { }
  }
};

if (Prototype.Browser.Opera) {
  Element.Methods.getStyle = Element.Methods.getStyle.wrap(
    function(proceed, element, style) {
      switch (style) {
        case 'left': case 'top': case 'right': case 'bottom':
          if (proceed(element, 'position') === 'static') return null;
        case 'height': case 'width':
          // returns '0px' for hidden elements; we want it to return null
          if (!Element.visible(element)) return null;

          // returns the border-box dimensions rather than the content-box
          // dimensions, so we subtract padding and borders from the value
          var dim = parseInt(proceed(element, style), 10);

          if (dim !== element['offset' + style.capitalize()])
            return dim + 'px';

          var properties;
          if (style === 'height') {
            properties = ['border-top-width', 'padding-top',
             'padding-bottom', 'border-bottom-width'];
          }
          else {
            properties = ['border-left-width', 'padding-left',
             'padding-right', 'border-right-width'];
          }
          return properties.inject(dim, function(memo, property) {
            var val = proceed(element, property);
            return val === null ? memo : memo - parseInt(val, 10);
          }) + 'px';
        default: return proceed(element, style);
      }
    }
  );

  Element.Methods.readAttribute = Element.Methods.readAttribute.wrap(
    function(proceed, element, attribute) {
      if (attribute === 'title') return element.title;
      return proceed(element, attribute);
    }
  );
}

else if (Prototype.Browser.IE) {
  // IE doesn't report offsets correctly for static elements, so we change them
  // to "relative" to get the values, then change them back.
  Element.Methods.getOffsetParent = Element.Methods.getOffsetParent.wrap(
    function(proceed, element) {
      element = $(element);
      var position = element.getStyle('position');
      if (position !== 'static') return proceed(element);
      element.setStyle({ position: 'relative' });
      var value = proceed(element);
      element.setStyle({ position: position });
      return value;
    }
  );

  $w('positionedOffset viewportOffset').each(function(method) {
    Element.Methods[method] = Element.Methods[method].wrap(
      function(proceed, element) {
        element = $(element);
        var position = element.getStyle('position');
        if (position !== 'static') return proceed(element);
        // Trigger hasLayout on the offset parent so that IE6 reports
        // accurate offsetTop and offsetLeft values for position: fixed.
        var offsetParent = element.getOffsetParent();
        if (offsetParent && offsetParent.getStyle('position') === 'fixed')
          offsetParent.setStyle({ zoom: 1 });
        element.setStyle({ position: 'relative' });
        var value = proceed(element);
        element.setStyle({ position: position });
        return value;
      }
    );
  });

  Element.Methods.getStyle = function(element, style) {
    element = $(element);
    style = (style == 'float' || style == 'cssFloat') ? 'styleFloat' : style.camelize();
    var value = element.style[style];
    if (!value && element.currentStyle) value = element.currentStyle[style];

    if (style == 'opacity') {
      if (value = (element.getStyle('filter') || '').match(/alpha\(opacity=(.*)\)/))
        if (value[1]) return parseFloat(value[1]) / 100;
      return 1.0;
    }

    if (value == 'auto') {
      if ((style == 'width' || style == 'height') && (element.getStyle('display') != 'none'))
        return element['offset' + style.capitalize()] + 'px';
      return null;
    }
    return value;
  };

  Element.Methods.setOpacity = function(element, value) {
    function stripAlpha(filter){
      return filter.replace(/alpha\([^\)]*\)/gi,'');
    }
    element = $(element);
    var currentStyle = element.currentStyle;
    if ((currentStyle && !currentStyle.hasLayout) ||
      (!currentStyle && element.style.zoom == 'normal'))
        element.style.zoom = 1;

    var filter = element.getStyle('filter'), style = element.style;
    if (value == 1 || value === '') {
      (filter = stripAlpha(filter)) ?
        style.filter = filter : style.removeAttribute('filter');
      return element;
    } else if (value < 0.00001) value = 0;
    style.filter = stripAlpha(filter) +
      'alpha(opacity=' + (value * 100) + ')';
    return element;
  };

  Element._attributeTranslations = {
    read: {
      names: {
        'class': 'className',
        'for':   'htmlFor'
      },
      values: {
        _getAttr: function(element, attribute) {
          return element.getAttribute(attribute, 2);
        },
        _getAttrNode: function(element, attribute) {
          var node = element.getAttributeNode(attribute);
          return node ? node.value : "";
        },
        _getEv: function(element, attribute) {
          attribute = element.getAttribute(attribute);
          return attribute ? attribute.toString().slice(23, -2) : null;
        },
        _flag: function(element, attribute) {
          return $(element).hasAttribute(attribute) ? attribute : null;
        },
        style: function(element) {
          return element.style.cssText.toLowerCase();
        },
        title: function(element) {
          return element.title;
        }
      }
    }
  };

  Element._attributeTranslations.write = {
    names: Object.extend({
      cellpadding: 'cellPadding',
      cellspacing: 'cellSpacing'
    }, Element._attributeTranslations.read.names),
    values: {
      checked: function(element, value) {
        element.checked = !!value;
      },

      style: function(element, value) {
        element.style.cssText = value ? value : '';
      }
    }
  };

  Element._attributeTranslations.has = {};

  $w('colSpan rowSpan vAlign dateTime accessKey tabIndex ' +
      'encType maxLength readOnly longDesc').each(function(attr) {
    Element._attributeTranslations.write.names[attr.toLowerCase()] = attr;
    Element._attributeTranslations.has[attr.toLowerCase()] = attr;
  });

  (function(v) {
    Object.extend(v, {
      href:        v._getAttr,
      src:         v._getAttr,
      type:        v._getAttr,
      action:      v._getAttrNode,
      disabled:    v._flag,
      checked:     v._flag,
      readonly:    v._flag,
      multiple:    v._flag,
      onload:      v._getEv,
      onunload:    v._getEv,
      onclick:     v._getEv,
      ondblclick:  v._getEv,
      onmousedown: v._getEv,
      onmouseup:   v._getEv,
      onmouseover: v._getEv,
      onmousemove: v._getEv,
      onmouseout:  v._getEv,
      onfocus:     v._getEv,
      onblur:      v._getEv,
      onkeypress:  v._getEv,
      onkeydown:   v._getEv,
      onkeyup:     v._getEv,
      onsubmit:    v._getEv,
      onreset:     v._getEv,
      onselect:    v._getEv,
      onchange:    v._getEv
    });
  })(Element._attributeTranslations.read.values);
}

else if (Prototype.Browser.Gecko && /rv:1\.8\.0/.test(navigator.userAgent)) {
  Element.Methods.setOpacity = function(element, value) {
    element = $(element);
    element.style.opacity = (value == 1) ? 0.999999 :
      (value === '') ? '' : (value < 0.00001) ? 0 : value;
    return element;
  };
}

else if (Prototype.Browser.WebKit) {
  Element.Methods.setOpacity = function(element, value) {
    element = $(element);
    element.style.opacity = (value == 1 || value === '') ? '' :
      (value < 0.00001) ? 0 : value;

    if (value == 1)
      if(element.tagName == 'IMG' && element.width) {
        element.width++; element.width--;
      } else try {
        var n = document.createTextNode(' ');
        element.appendChild(n);
        element.removeChild(n);
      } catch (e) { }

    return element;
  };

  // Safari returns margins on body which is incorrect if the child is absolutely
  // positioned.  For performance reasons, redefine Element#cumulativeOffset for
  // KHTML/WebKit only.
  Element.Methods.cumulativeOffset = function(element) {
    var valueT = 0, valueL = 0;
    do {
      valueT += element.offsetTop  || 0;
      valueL += element.offsetLeft || 0;
      if (element.offsetParent == document.body)
        if (Element.getStyle(element, 'position') == 'absolute') break;

      element = element.offsetParent;
    } while (element);

    return Element._returnOffset(valueL, valueT);
  };
}

if (Prototype.Browser.IE || Prototype.Browser.Opera) {
  // IE and Opera are missing .innerHTML support for TABLE-related and SELECT elements
  Element.Methods.update = function(element, content) {
    element = $(element);

    if (content && content.toElement) content = content.toElement();
    if (Object.isElement(content)) return element.update().insert(content);

    content = Object.toHTML(content);
    var tagName = element.tagName.toUpperCase();

    if (tagName in Element._insertionTranslations.tags) {
      $A(element.childNodes).each(function(node) { element.removeChild(node) });
      Element._getContentFromAnonymousElement(tagName, content.stripScripts())
        .each(function(node) { element.appendChild(node) });
    }
    else element.innerHTML = content.stripScripts();

    content.evalScripts.bind(content).defer();
    return element;
  };
}

if ('outerHTML' in document.createElement('div')) {
  Element.Methods.replace = function(element, content) {
    element = $(element);

    if (content && content.toElement) content = content.toElement();
    if (Object.isElement(content)) {
      element.parentNode.replaceChild(content, element);
      return element;
    }

    content = Object.toHTML(content);
    var parent = element.parentNode, tagName = parent.tagName.toUpperCase();

    if (Element._insertionTranslations.tags[tagName]) {
      var nextSibling = element.next();
      var fragments = Element._getContentFromAnonymousElement(tagName, content.stripScripts());
      parent.removeChild(element);
      if (nextSibling)
        fragments.each(function(node) { parent.insertBefore(node, nextSibling) });
      else
        fragments.each(function(node) { parent.appendChild(node) });
    }
    else element.outerHTML = content.stripScripts();

    content.evalScripts.bind(content).defer();
    return element;
  };
}

Element._returnOffset = function(l, t) {
  var result = [l, t];
  result.left = l;
  result.top = t;
  return result;
};

Element._getContentFromAnonymousElement = function(tagName, html) {
  var div = new Element('div'), t = Element._insertionTranslations.tags[tagName];
  if (t) {
    div.innerHTML = t[0] + html + t[1];
    t[2].times(function() { div = div.firstChild });
  } else div.innerHTML = html;
  return $A(div.childNodes);
};

Element._insertionTranslations = {
  before: function(element, node) {
    element.parentNode.insertBefore(node, element);
  },
  top: function(element, node) {
    element.insertBefore(node, element.firstChild);
  },
  bottom: function(element, node) {
    element.appendChild(node);
  },
  after: function(element, node) {
    element.parentNode.insertBefore(node, element.nextSibling);
  },
  tags: {
    TABLE:  ['<table>',                '</table>',                   1],
    TBODY:  ['<table><tbody>',         '</tbody></table>',           2],
    TR:     ['<table><tbody><tr>',     '</tr></tbody></table>',      3],
    TD:     ['<table><tbody><tr><td>', '</td></tr></tbody></table>', 4],
    SELECT: ['<select>',               '</select>',                  1]
  }
};

(function() {
  Object.extend(this.tags, {
    THEAD: this.tags.TBODY,
    TFOOT: this.tags.TBODY,
    TH:    this.tags.TD
  });
}).call(Element._insertionTranslations);

Element.Methods.Simulated = {
  hasAttribute: function(element, attribute) {
    attribute = Element._attributeTranslations.has[attribute] || attribute;
    var node = $(element).getAttributeNode(attribute);
    return node && node.specified;
  }
};

Element.Methods.ByTag = { };

Object.extend(Element, Element.Methods);

if (!Prototype.BrowserFeatures.ElementExtensions &&
    document.createElement('div').__proto__) {
  window.HTMLElement = { };
  window.HTMLElement.prototype = document.createElement('div').__proto__;
  Prototype.BrowserFeatures.ElementExtensions = true;
}

Element.extend = (function() {
  if (Prototype.BrowserFeatures.SpecificElementExtensions)
    return Prototype.K;

  var Methods = { }, ByTag = Element.Methods.ByTag;

  var extend = Object.extend(function(element) {
    if (!element || element._extendedByPrototype ||
        element.nodeType != 1 || element == window) return element;

    var methods = Object.clone(Methods),
      tagName = element.tagName, property, value;

    // extend methods for specific tags
    if (ByTag[tagName]) Object.extend(methods, ByTag[tagName]);

    for (property in methods) {
      value = methods[property];
      if (Object.isFunction(value) && !(property in element))
        element[property] = value.methodize();
    }

    element._extendedByPrototype = Prototype.emptyFunction;
    return element;

  }, {
    refresh: function() {
      // extend methods for all tags (Safari doesn't need this)
      if (!Prototype.BrowserFeatures.ElementExtensions) {
        Object.extend(Methods, Element.Methods);
        Object.extend(Methods, Element.Methods.Simulated);
      }
    }
  });

  extend.refresh();
  return extend;
})();

Element.hasAttribute = function(element, attribute) {
  if (element.hasAttribute) return element.hasAttribute(attribute);
  return Element.Methods.Simulated.hasAttribute(element, attribute);
};

Element.addMethods = function(methods) {
  var F = Prototype.BrowserFeatures, T = Element.Methods.ByTag;

  if (!methods) {
    Object.extend(Form, Form.Methods);
    Object.extend(Form.Element, Form.Element.Methods);
    Object.extend(Element.Methods.ByTag, {
      "FORM":     Object.clone(Form.Methods),
      "INPUT":    Object.clone(Form.Element.Methods),
      "SELECT":   Object.clone(Form.Element.Methods),
      "TEXTAREA": Object.clone(Form.Element.Methods)
    });
  }

  if (arguments.length == 2) {
    var tagName = methods;
    methods = arguments[1];
  }

  if (!tagName) Object.extend(Element.Methods, methods || { });
  else {
    if (Object.isArray(tagName)) tagName.each(extend);
    else extend(tagName);
  }

  function extend(tagName) {
    tagName = tagName.toUpperCase();
    if (!Element.Methods.ByTag[tagName])
      Element.Methods.ByTag[tagName] = { };
    Object.extend(Element.Methods.ByTag[tagName], methods);
  }

  function copy(methods, destination, onlyIfAbsent) {
    onlyIfAbsent = onlyIfAbsent || false;
    for (var property in methods) {
      var value = methods[property];
      if (!Object.isFunction(value)) continue;
      if (!onlyIfAbsent || !(property in destination))
        destination[property] = value.methodize();
    }
  }

  function findDOMClass(tagName) {
    var klass;
    var trans = {
      "OPTGROUP": "OptGroup", "TEXTAREA": "TextArea", "P": "Paragraph",
      "FIELDSET": "FieldSet", "UL": "UList", "OL": "OList", "DL": "DList",
      "DIR": "Directory", "H1": "Heading", "H2": "Heading", "H3": "Heading",
      "H4": "Heading", "H5": "Heading", "H6": "Heading", "Q": "Quote",
      "INS": "Mod", "DEL": "Mod", "A": "Anchor", "IMG": "Image", "CAPTION":
      "TableCaption", "COL": "TableCol", "COLGROUP": "TableCol", "THEAD":
      "TableSection", "TFOOT": "TableSection", "TBODY": "TableSection", "TR":
      "TableRow", "TH": "TableCell", "TD": "TableCell", "FRAMESET":
      "FrameSet", "IFRAME": "IFrame"
    };
    if (trans[tagName]) klass = 'HTML' + trans[tagName] + 'Element';
    if (window[klass]) return window[klass];
    klass = 'HTML' + tagName + 'Element';
    if (window[klass]) return window[klass];
    klass = 'HTML' + tagName.capitalize() + 'Element';
    if (window[klass]) return window[klass];

    window[klass] = { };
    window[klass].prototype = document.createElement(tagName).__proto__;
    return window[klass];
  }

  if (F.ElementExtensions) {
    copy(Element.Methods, HTMLElement.prototype);
    copy(Element.Methods.Simulated, HTMLElement.prototype, true);
  }

  if (F.SpecificElementExtensions) {
    for (var tag in Element.Methods.ByTag) {
      var klass = findDOMClass(tag);
      if (Object.isUndefined(klass)) continue;
      copy(T[tag], klass.prototype);
    }
  }

  Object.extend(Element, Element.Methods);
  delete Element.ByTag;

  if (Element.extend.refresh) Element.extend.refresh();
  Element.cache = { };
};

document.viewport = {
  getDimensions: function() {
    var dimensions = { };
    var B = Prototype.Browser;
    $w('width height').each(function(d) {
      var D = d.capitalize();
      dimensions[d] = (B.WebKit && !document.evaluate) ? self['inner' + D] :
        (B.Opera) ? document.body['client' + D] : document.documentElement['client' + D];
    });
    return dimensions;
  },

  getWidth: function() {
    return this.getDimensions().width;
  },

  getHeight: function() {
    return this.getDimensions().height;
  },

  getScrollOffsets: function() {
    return Element._returnOffset(
      window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft,
      window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop);
  }
};
/* Portions of the Selector class are derived from Jack Slocum’s DomQuery,
 * part of YUI-Ext version 0.40, distributed under the terms of an MIT-style
 * license.  Please see http://www.yui-ext.com/ for more information. */

var Selector = Class.create({
  initialize: function(expression) {
    this.expression = expression.strip();
    this.compileMatcher();
  },

  shouldUseXPath: function() {
    if (!Prototype.BrowserFeatures.XPath) return false;

    var e = this.expression;

    // Safari 3 chokes on :*-of-type and :empty
    if (Prototype.Browser.WebKit &&
     (e.include("-of-type") || e.include(":empty")))
      return false;

    // XPath can't do namespaced attributes, nor can it read
    // the "checked" property from DOM nodes
    if ((/(\[[\w-]*?:|:checked)/).test(this.expression))
      return false;

    return true;
  },

  compileMatcher: function() {
    if (this.shouldUseXPath())
      return this.compileXPathMatcher();

    var e = this.expression, ps = Selector.patterns, h = Selector.handlers,
        c = Selector.criteria, le, p, m;

    if (Selector._cache[e]) {
      this.matcher = Selector._cache[e];
      return;
    }

    this.matcher = ["this.matcher = function(root) {",
                    "var r = root, h = Selector.handlers, c = false, n;"];

    while (e && le != e && (/\S/).test(e)) {
      le = e;
      for (var i in ps) {
        p = ps[i];
        if (m = e.match(p)) {
          this.matcher.push(Object.isFunction(c[i]) ? c[i](m) :
    	      new Template(c[i]).evaluate(m));
          e = e.replace(m[0], '');
          break;
        }
      }
    }

    this.matcher.push("return h.unique(n);\n}");
    eval(this.matcher.join('\n'));
    Selector._cache[this.expression] = this.matcher;
  },

  compileXPathMatcher: function() {
    var e = this.expression, ps = Selector.patterns,
        x = Selector.xpath, le, m;

    if (Selector._cache[e]) {
      this.xpath = Selector._cache[e]; return;
    }

    this.matcher = ['.//*'];
    while (e && le != e && (/\S/).test(e)) {
      le = e;
      for (var i in ps) {
        if (m = e.match(ps[i])) {
          this.matcher.push(Object.isFunction(x[i]) ? x[i](m) :
            new Template(x[i]).evaluate(m));
          e = e.replace(m[0], '');
          break;
        }
      }
    }

    this.xpath = this.matcher.join('');
    Selector._cache[this.expression] = this.xpath;
  },

  findElements: function(root) {
    root = root || document;
    if (this.xpath) return document._getElementsByXPath(this.xpath, root);
    return this.matcher(root);
  },

  match: function(element) {
    this.tokens = [];

    var e = this.expression, ps = Selector.patterns, as = Selector.assertions;
    var le, p, m;

    while (e && le !== e && (/\S/).test(e)) {
      le = e;
      for (var i in ps) {
        p = ps[i];
        if (m = e.match(p)) {
          // use the Selector.assertions methods unless the selector
          // is too complex.
          if (as[i]) {
            this.tokens.push([i, Object.clone(m)]);
            e = e.replace(m[0], '');
          } else {
            // reluctantly do a document-wide search
            // and look for a match in the array
            return this.findElements(document).include(element);
          }
        }
      }
    }

    var match = true, name, matches;
    for (var i = 0, token; token = this.tokens[i]; i++) {
      name = token[0], matches = token[1];
      if (!Selector.assertions[name](element, matches)) {
        match = false; break;
      }
    }

    return match;
  },

  toString: function() {
    return this.expression;
  },

  inspect: function() {
    return "#<Selector:" + this.expression.inspect() + ">";
  }
});

Object.extend(Selector, {
  _cache: { },

  xpath: {
    descendant:   "//*",
    child:        "/*",
    adjacent:     "/following-sibling::*[1]",
    laterSibling: '/following-sibling::*',
    tagName:      function(m) {
      if (m[1] == '*') return '';
      return "[local-name()='" + m[1].toLowerCase() +
             "' or local-name()='" + m[1].toUpperCase() + "']";
    },
    className:    "[contains(concat(' ', @class, ' '), ' #{1} ')]",
    id:           "[@id='#{1}']",
    attrPresence: function(m) {
      m[1] = m[1].toLowerCase();
      return new Template("[@#{1}]").evaluate(m);
    },
    attr: function(m) {
      m[1] = m[1].toLowerCase();
      m[3] = m[5] || m[6];
      return new Template(Selector.xpath.operators[m[2]]).evaluate(m);
    },
    pseudo: function(m) {
      var h = Selector.xpath.pseudos[m[1]];
      if (!h) return '';
      if (Object.isFunction(h)) return h(m);
      return new Template(Selector.xpath.pseudos[m[1]]).evaluate(m);
    },
    operators: {
      '=':  "[@#{1}='#{3}']",
      '!=': "[@#{1}!='#{3}']",
      '^=': "[starts-with(@#{1}, '#{3}')]",
      '$=': "[substring(@#{1}, (string-length(@#{1}) - string-length('#{3}') + 1))='#{3}']",
      '*=': "[contains(@#{1}, '#{3}')]",
      '~=': "[contains(concat(' ', @#{1}, ' '), ' #{3} ')]",
      '|=': "[contains(concat('-', @#{1}, '-'), '-#{3}-')]"
    },
    pseudos: {
      'first-child': '[not(preceding-sibling::*)]',
      'last-child':  '[not(following-sibling::*)]',
      'only-child':  '[not(preceding-sibling::* or following-sibling::*)]',
      'empty':       "[count(*) = 0 and (count(text()) = 0 or translate(text(), ' \t\r\n', '') = '')]",
      'checked':     "[@checked]",
      'disabled':    "[@disabled]",
      'enabled':     "[not(@disabled)]",
      'not': function(m) {
        var e = m[6], p = Selector.patterns,
            x = Selector.xpath, le, v;

        var exclusion = [];
        while (e && le != e && (/\S/).test(e)) {
          le = e;
          for (var i in p) {
            if (m = e.match(p[i])) {
              v = Object.isFunction(x[i]) ? x[i](m) : new Template(x[i]).evaluate(m);
              exclusion.push("(" + v.substring(1, v.length - 1) + ")");
              e = e.replace(m[0], '');
              break;
            }
          }
        }
        return "[not(" + exclusion.join(" and ") + ")]";
      },
      'nth-child':      function(m) {
        return Selector.xpath.pseudos.nth("(count(./preceding-sibling::*) + 1) ", m);
      },
      'nth-last-child': function(m) {
        return Selector.xpath.pseudos.nth("(count(./following-sibling::*) + 1) ", m);
      },
      'nth-of-type':    function(m) {
        return Selector.xpath.pseudos.nth("position() ", m);
      },
      'nth-last-of-type': function(m) {
        return Selector.xpath.pseudos.nth("(last() + 1 - position()) ", m);
      },
      'first-of-type':  function(m) {
        m[6] = "1"; return Selector.xpath.pseudos['nth-of-type'](m);
      },
      'last-of-type':   function(m) {
        m[6] = "1"; return Selector.xpath.pseudos['nth-last-of-type'](m);
      },
      'only-of-type':   function(m) {
        var p = Selector.xpath.pseudos; return p['first-of-type'](m) + p['last-of-type'](m);
      },
      nth: function(fragment, m) {
        var mm, formula = m[6], predicate;
        if (formula == 'even') formula = '2n+0';
        if (formula == 'odd')  formula = '2n+1';
        if (mm = formula.match(/^(\d+)$/)) // digit only
          return '[' + fragment + "= " + mm[1] + ']';
        if (mm = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
          if (mm[1] == "-") mm[1] = -1;
          var a = mm[1] ? Number(mm[1]) : 1;
          var b = mm[2] ? Number(mm[2]) : 0;
          predicate = "[((#{fragment} - #{b}) mod #{a} = 0) and " +
          "((#{fragment} - #{b}) div #{a} >= 0)]";
          return new Template(predicate).evaluate({
            fragment: fragment, a: a, b: b });
        }
      }
    }
  },

  criteria: {
    tagName:      'n = h.tagName(n, r, "#{1}", c);      c = false;',
    className:    'n = h.className(n, r, "#{1}", c);    c = false;',
    id:           'n = h.id(n, r, "#{1}", c);           c = false;',
    attrPresence: 'n = h.attrPresence(n, r, "#{1}", c); c = false;',
    attr: function(m) {
      m[3] = (m[5] || m[6]);
      return new Template('n = h.attr(n, r, "#{1}", "#{3}", "#{2}", c); c = false;').evaluate(m);
    },
    pseudo: function(m) {
      if (m[6]) m[6] = m[6].replace(/"/g, '\\"');
      return new Template('n = h.pseudo(n, "#{1}", "#{6}", r, c); c = false;').evaluate(m);
    },
    descendant:   'c = "descendant";',
    child:        'c = "child";',
    adjacent:     'c = "adjacent";',
    laterSibling: 'c = "laterSibling";'
  },

  patterns: {
    // combinators must be listed first
    // (and descendant needs to be last combinator)
    laterSibling: /^\s*~\s*/,
    child:        /^\s*>\s*/,
    adjacent:     /^\s*\+\s*/,
    descendant:   /^\s/,

    // selectors follow
    tagName:      /^\s*(\*|[\w\-]+)(\b|$)?/,
    id:           /^#([\w\-\*]+)(\b|$)/,
    className:    /^\.([\w\-\*]+)(\b|$)/,
    pseudo:
/^:((first|last|nth|nth-last|only)(-child|-of-type)|empty|checked|(en|dis)abled|not)(\((.*?)\))?(\b|$|(?=\s|[:+~>]))/,
    attrPresence: /^\[([\w]+)\]/,
    attr:         /\[((?:[\w-]*:)?[\w-]+)\s*(?:([!^$*~|]?=)\s*((['"])([^\4]*?)\4|([^'"][^\]]*?)))?\]/
  },

  // for Selector.match and Element#match
  assertions: {
    tagName: function(element, matches) {
      return matches[1].toUpperCase() == element.tagName.toUpperCase();
    },

    className: function(element, matches) {
      return Element.hasClassName(element, matches[1]);
    },

    id: function(element, matches) {
      return element.id === matches[1];
    },

    attrPresence: function(element, matches) {
      return Element.hasAttribute(element, matches[1]);
    },

    attr: function(element, matches) {
      var nodeValue = Element.readAttribute(element, matches[1]);
      return nodeValue && Selector.operators[matches[2]](nodeValue, matches[5] || matches[6]);
    }
  },

  handlers: {
    // UTILITY FUNCTIONS
    // joins two collections
    concat: function(a, b) {
      for (var i = 0, node; node = b[i]; i++)
        a.push(node);
      return a;
    },

    // marks an array of nodes for counting
    mark: function(nodes) {
      var _true = Prototype.emptyFunction;
      for (var i = 0, node; node = nodes[i]; i++)
        node._countedByPrototype = _true;
      return nodes;
    },

    unmark: function(nodes) {
      for (var i = 0, node; node = nodes[i]; i++)
        node._countedByPrototype = undefined;
      return nodes;
    },

    // mark each child node with its position (for nth calls)
    // "ofType" flag indicates whether we're indexing for nth-of-type
    // rather than nth-child
    index: function(parentNode, reverse, ofType) {
      parentNode._countedByPrototype = Prototype.emptyFunction;
      if (reverse) {
        for (var nodes = parentNode.childNodes, i = nodes.length - 1, j = 1; i >= 0; i--) {
          var node = nodes[i];
          if (node.nodeType == 1 && (!ofType || node._countedByPrototype)) node.nodeIndex = j++;
        }
      } else {
        for (var i = 0, j = 1, nodes = parentNode.childNodes; node = nodes[i]; i++)
          if (node.nodeType == 1 && (!ofType || node._countedByPrototype)) node.nodeIndex = j++;
      }
    },

    // filters out duplicates and extends all nodes
    unique: function(nodes) {
      if (nodes.length == 0) return nodes;
      var results = [], n;
      for (var i = 0, l = nodes.length; i < l; i++)
        if (!(n = nodes[i])._countedByPrototype) {
          n._countedByPrototype = Prototype.emptyFunction;
          results.push(Element.extend(n));
        }
      return Selector.handlers.unmark(results);
    },

    // COMBINATOR FUNCTIONS
    descendant: function(nodes) {
      var h = Selector.handlers;
      for (var i = 0, results = [], node; node = nodes[i]; i++)
        h.concat(results, node.getElementsByTagName('*'));
      return results;
    },

    child: function(nodes) {
      var h = Selector.handlers;
      for (var i = 0, results = [], node; node = nodes[i]; i++) {
        for (var j = 0, child; child = node.childNodes[j]; j++)
          if (child.nodeType == 1 && child.tagName != '!') results.push(child);
      }
      return results;
    },

    adjacent: function(nodes) {
      for (var i = 0, results = [], node; node = nodes[i]; i++) {
        var next = this.nextElementSibling(node);
        if (next) results.push(next);
      }
      return results;
    },

    laterSibling: function(nodes) {
      var h = Selector.handlers;
      for (var i = 0, results = [], node; node = nodes[i]; i++)
        h.concat(results, Element.nextSiblings(node));
      return results;
    },

    nextElementSibling: function(node) {
      while (node = node.nextSibling)
	      if (node.nodeType == 1) return node;
      return null;
    },

    previousElementSibling: function(node) {
      while (node = node.previousSibling)
        if (node.nodeType == 1) return node;
      return null;
    },

    // TOKEN FUNCTIONS
    tagName: function(nodes, root, tagName, combinator) {
      var uTagName = tagName.toUpperCase();
      var results = [], h = Selector.handlers;
      if (nodes) {
        if (combinator) {
          // fastlane for ordinary descendant combinators
          if (combinator == "descendant") {
            for (var i = 0, node; node = nodes[i]; i++)
              h.concat(results, node.getElementsByTagName(tagName));
            return results;
          } else nodes = this[combinator](nodes);
          if (tagName == "*") return nodes;
        }
        for (var i = 0, node; node = nodes[i]; i++)
          if (node.tagName.toUpperCase() === uTagName) results.push(node);
        return results;
      } else return root.getElementsByTagName(tagName);
    },

    id: function(nodes, root, id, combinator) {
      var targetNode = $(id), h = Selector.handlers;
      if (!targetNode) return [];
      if (!nodes && root == document) return [targetNode];
      if (nodes) {
        if (combinator) {
          if (combinator == 'child') {
            for (var i = 0, node; node = nodes[i]; i++)
              if (targetNode.parentNode == node) return [targetNode];
          } else if (combinator == 'descendant') {
            for (var i = 0, node; node = nodes[i]; i++)
              if (Element.descendantOf(targetNode, node)) return [targetNode];
          } else if (combinator == 'adjacent') {
            for (var i = 0, node; node = nodes[i]; i++)
              if (Selector.handlers.previousElementSibling(targetNode) == node)
                return [targetNode];
          } else nodes = h[combinator](nodes);
        }
        for (var i = 0, node; node = nodes[i]; i++)
          if (node == targetNode) return [targetNode];
        return [];
      }
      return (targetNode && Element.descendantOf(targetNode, root)) ? [targetNode] : [];
    },

    className: function(nodes, root, className, combinator) {
      if (nodes && combinator) nodes = this[combinator](nodes);
      return Selector.handlers.byClassName(nodes, root, className);
    },

    byClassName: function(nodes, root, className) {
      if (!nodes) nodes = Selector.handlers.descendant([root]);
      var needle = ' ' + className + ' ';
      for (var i = 0, results = [], node, nodeClassName; node = nodes[i]; i++) {
        nodeClassName = node.className;
        if (nodeClassName.length == 0) continue;
        if (nodeClassName == className || (' ' + nodeClassName + ' ').include(needle))
          results.push(node);
      }
      return results;
    },

    attrPresence: function(nodes, root, attr, combinator) {
      if (!nodes) nodes = root.getElementsByTagName("*");
      if (nodes && combinator) nodes = this[combinator](nodes);
      var results = [];
      for (var i = 0, node; node = nodes[i]; i++)
        if (Element.hasAttribute(node, attr)) results.push(node);
      return results;
    },

    attr: function(nodes, root, attr, value, operator, combinator) {
      if (!nodes) nodes = root.getElementsByTagName("*");
      if (nodes && combinator) nodes = this[combinator](nodes);
      var handler = Selector.operators[operator], results = [];
      for (var i = 0, node; node = nodes[i]; i++) {
        var nodeValue = Element.readAttribute(node, attr);
        if (nodeValue === null) continue;
        if (handler(nodeValue, value)) results.push(node);
      }
      return results;
    },

    pseudo: function(nodes, name, value, root, combinator) {
      if (nodes && combinator) nodes = this[combinator](nodes);
      if (!nodes) nodes = root.getElementsByTagName("*");
      return Selector.pseudos[name](nodes, value, root);
    }
  },

  pseudos: {
    'first-child': function(nodes, value, root) {
      for (var i = 0, results = [], node; node = nodes[i]; i++) {
        if (Selector.handlers.previousElementSibling(node)) continue;
          results.push(node);
      }
      return results;
    },
    'last-child': function(nodes, value, root) {
      for (var i = 0, results = [], node; node = nodes[i]; i++) {
        if (Selector.handlers.nextElementSibling(node)) continue;
          results.push(node);
      }
      return results;
    },
    'only-child': function(nodes, value, root) {
      var h = Selector.handlers;
      for (var i = 0, results = [], node; node = nodes[i]; i++)
        if (!h.previousElementSibling(node) && !h.nextElementSibling(node))
          results.push(node);
      return results;
    },
    'nth-child':        function(nodes, formula, root) {
      return Selector.pseudos.nth(nodes, formula, root);
    },
    'nth-last-child':   function(nodes, formula, root) {
      return Selector.pseudos.nth(nodes, formula, root, true);
    },
    'nth-of-type':      function(nodes, formula, root) {
      return Selector.pseudos.nth(nodes, formula, root, false, true);
    },
    'nth-last-of-type': function(nodes, formula, root) {
      return Selector.pseudos.nth(nodes, formula, root, true, true);
    },
    'first-of-type':    function(nodes, formula, root) {
      return Selector.pseudos.nth(nodes, "1", root, false, true);
    },
    'last-of-type':     function(nodes, formula, root) {
      return Selector.pseudos.nth(nodes, "1", root, true, true);
    },
    'only-of-type':     function(nodes, formula, root) {
      var p = Selector.pseudos;
      return p['last-of-type'](p['first-of-type'](nodes, formula, root), formula, root);
    },

    // handles the an+b logic
    getIndices: function(a, b, total) {
      if (a == 0) return b > 0 ? [b] : [];
      return $R(1, total).inject([], function(memo, i) {
        if (0 == (i - b) % a && (i - b) / a >= 0) memo.push(i);
        return memo;
      });
    },

    // handles nth(-last)-child, nth(-last)-of-type, and (first|last)-of-type
    nth: function(nodes, formula, root, reverse, ofType) {
      if (nodes.length == 0) return [];
      if (formula == 'even') formula = '2n+0';
      if (formula == 'odd')  formula = '2n+1';
      var h = Selector.handlers, results = [], indexed = [], m;
      h.mark(nodes);
      for (var i = 0, node; node = nodes[i]; i++) {
        if (!node.parentNode._countedByPrototype) {
          h.index(node.parentNode, reverse, ofType);
          indexed.push(node.parentNode);
        }
      }
      if (formula.match(/^\d+$/)) { // just a number
        formula = Number(formula);
        for (var i = 0, node; node = nodes[i]; i++)
          if (node.nodeIndex == formula) results.push(node);
      } else if (m = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
        if (m[1] == "-") m[1] = -1;
        var a = m[1] ? Number(m[1]) : 1;
        var b = m[2] ? Number(m[2]) : 0;
        var indices = Selector.pseudos.getIndices(a, b, nodes.length);
        for (var i = 0, node, l = indices.length; node = nodes[i]; i++) {
          for (var j = 0; j < l; j++)
            if (node.nodeIndex == indices[j]) results.push(node);
        }
      }
      h.unmark(nodes);
      h.unmark(indexed);
      return results;
    },

    'empty': function(nodes, value, root) {
      for (var i = 0, results = [], node; node = nodes[i]; i++) {
        // IE treats comments as element nodes
        if (node.tagName == '!' || (node.firstChild && !node.innerHTML.match(/^\s*$/))) continue;
        results.push(node);
      }
      return results;
    },

    'not': function(nodes, selector, root) {
      var h = Selector.handlers, selectorType, m;
      var exclusions = new Selector(selector).findElements(root);
      h.mark(exclusions);
      for (var i = 0, results = [], node; node = nodes[i]; i++)
        if (!node._countedByPrototype) results.push(node);
      h.unmark(exclusions);
      return results;
    },

    'enabled': function(nodes, value, root) {
      for (var i = 0, results = [], node; node = nodes[i]; i++)
        if (!node.disabled) results.push(node);
      return results;
    },

    'disabled': function(nodes, value, root) {
      for (var i = 0, results = [], node; node = nodes[i]; i++)
        if (node.disabled) results.push(node);
      return results;
    },

    'checked': function(nodes, value, root) {
      for (var i = 0, results = [], node; node = nodes[i]; i++)
        if (node.checked) results.push(node);
      return results;
    }
  },

  operators: {
    '=':  function(nv, v) { return nv == v; },
    '!=': function(nv, v) { return nv != v; },
    '^=': function(nv, v) { return nv.startsWith(v); },
    '$=': function(nv, v) { return nv.endsWith(v); },
    '*=': function(nv, v) { return nv.include(v); },
    '~=': function(nv, v) { return (' ' + nv + ' ').include(' ' + v + ' '); },
    '|=': function(nv, v) { return ('-' + nv.toUpperCase() + '-').include('-' + v.toUpperCase() + '-'); }
  },

  split: function(expression) {
    var expressions = [];
    expression.scan(/(([\w#:.~>+()\s-]+|\*|\[.*?\])+)\s*(,|$)/, function(m) {
      expressions.push(m[1].strip());
    });
    return expressions;
  },

  matchElements: function(elements, expression) {
    var matches = $$(expression), h = Selector.handlers;
    h.mark(matches);
    for (var i = 0, results = [], element; element = elements[i]; i++)
      if (element._countedByPrototype) results.push(element);
    h.unmark(matches);
    return results;
  },

  findElement: function(elements, expression, index) {
    if (Object.isNumber(expression)) {
      index = expression; expression = false;
    }
    return Selector.matchElements(elements, expression || '*')[index || 0];
  },

  findChildElements: function(element, expressions) {
    expressions = Selector.split(expressions.join(','));
    var results = [], h = Selector.handlers;
    for (var i = 0, l = expressions.length, selector; i < l; i++) {
      selector = new Selector(expressions[i].strip());
      h.concat(results, selector.findElements(element));
    }
    return (l > 1) ? h.unique(results) : results;
  }
});

if (Prototype.Browser.IE) {
  Object.extend(Selector.handlers, {
    // IE returns comment nodes on getElementsByTagName("*").
    // Filter them out.
    concat: function(a, b) {
      for (var i = 0, node; node = b[i]; i++)
        if (node.tagName !== "!") a.push(node);
      return a;
    },

    // IE improperly serializes _countedByPrototype in (inner|outer)HTML.
    unmark: function(nodes) {
      for (var i = 0, node; node = nodes[i]; i++)
        node.removeAttribute('_countedByPrototype');
      return nodes;
    }
  });
}

function $$() {
  return Selector.findChildElements(document, $A(arguments));
}
var Form = {
  reset: function(form) {
    $(form).reset();
    return form;
  },

  serializeElements: function(elements, options) {
    if (typeof options != 'object') options = { hash: !!options };
    else if (Object.isUndefined(options.hash)) options.hash = true;
    var key, value, submitted = false, submit = options.submit;

    var data = elements.inject({ }, function(result, element) {
      if (!element.disabled && element.name) {
        key = element.name; value = $(element).getValue();
        if (value != null && (element.type != 'submit' || (!submitted &&
            submit !== false && (!submit || key == submit) && (submitted = true)))) {
          if (key in result) {
            // a key is already present; construct an array of values
            if (!Object.isArray(result[key])) result[key] = [result[key]];
            result[key].push(value);
          }
          else result[key] = value;
        }
      }
      return result;
    });

    return options.hash ? data : Object.toQueryString(data);
  }
};

Form.Methods = {
  serialize: function(form, options) {
    return Form.serializeElements(Form.getElements(form), options);
  },

  getElements: function(form) {
    return $A($(form).getElementsByTagName('*')).inject([],
      function(elements, child) {
        if (Form.Element.Serializers[child.tagName.toLowerCase()])
          elements.push(Element.extend(child));
        return elements;
      }
    );
  },

  getInputs: function(form, typeName, name) {
    form = $(form);
    var inputs = form.getElementsByTagName('input');

    if (!typeName && !name) return $A(inputs).map(Element.extend);

    for (var i = 0, matchingInputs = [], length = inputs.length; i < length; i++) {
      var input = inputs[i];
      if ((typeName && input.type != typeName) || (name && input.name != name))
        continue;
      matchingInputs.push(Element.extend(input));
    }

    return matchingInputs;
  },

  disable: function(form) {
    form = $(form);
    Form.getElements(form).invoke('disable');
    return form;
  },

  enable: function(form) {
    form = $(form);
    Form.getElements(form).invoke('enable');
    return form;
  },

  findFirstElement: function(form) {
    var elements = $(form).getElements().findAll(function(element) {
      return 'hidden' != element.type && !element.disabled;
    });
    var firstByIndex = elements.findAll(function(element) {
      return element.hasAttribute('tabIndex') && element.tabIndex >= 0;
    }).sortBy(function(element) { return element.tabIndex }).first();

    return firstByIndex ? firstByIndex : elements.find(function(element) {
      return ['input', 'select', 'textarea'].include(element.tagName.toLowerCase());
    });
  },

  focusFirstElement: function(form) {
    form = $(form);
    form.findFirstElement().activate();
    return form;
  },

  request: function(form, options) {
    form = $(form), options = Object.clone(options || { });

    var params = options.parameters, action = form.readAttribute('action') || '';
    if (action.blank()) action = window.location.href;
    options.parameters = form.serialize(true);

    if (params) {
      if (Object.isString(params)) params = params.toQueryParams();
      Object.extend(options.parameters, params);
    }

    if (form.hasAttribute('method') && !options.method)
      options.method = form.method;

    return new Ajax.Request(action, options);
  }
};

/*--------------------------------------------------------------------------*/

Form.Element = {
  focus: function(element) {
    $(element).focus();
    return element;
  },

  select: function(element) {
    $(element).select();
    return element;
  }
};

Form.Element.Methods = {
  serialize: function(element) {
    element = $(element);
    if (!element.disabled && element.name) {
      var value = element.getValue();
      if (value != undefined) {
        var pair = { };
        pair[element.name] = value;
        return Object.toQueryString(pair);
      }
    }
    return '';
  },

  getValue: function(element) {
    element = $(element);
    var method = element.tagName.toLowerCase();
    return Form.Element.Serializers[method](element);
  },

  setValue: function(element, value) {
    element = $(element);
    var method = element.tagName.toLowerCase();
    Form.Element.Serializers[method](element, value);
    return element;
  },

  clear: function(element) {
    $(element).value = '';
    return element;
  },

  present: function(element) {
    return $(element).value != '';
  },

  activate: function(element) {
    element = $(element);
    try {
      element.focus();
      if (element.select && (element.tagName.toLowerCase() != 'input' ||
          !['button', 'reset', 'submit'].include(element.type)))
        element.select();
    } catch (e) { }
    return element;
  },

  disable: function(element) {
    element = $(element);
    element.blur();
    element.disabled = true;
    return element;
  },

  enable: function(element) {
    element = $(element);
    element.disabled = false;
    return element;
  }
};

/*--------------------------------------------------------------------------*/

var Field = Form.Element;
var $F = Form.Element.Methods.getValue;

/*--------------------------------------------------------------------------*/

Form.Element.Serializers = {
  input: function(element, value) {
    switch (element.type.toLowerCase()) {
      case 'checkbox':
      case 'radio':
        return Form.Element.Serializers.inputSelector(element, value);
      default:
        return Form.Element.Serializers.textarea(element, value);
    }
  },

  inputSelector: function(element, value) {
    if (Object.isUndefined(value)) return element.checked ? element.value : null;
    else element.checked = !!value;
  },

  textarea: function(element, value) {
    if (Object.isUndefined(value)) return element.value;
    else element.value = value;
  },

  select: function(element, index) {
    if (Object.isUndefined(index))
      return this[element.type == 'select-one' ?
        'selectOne' : 'selectMany'](element);
    else {
      var opt, value, single = !Object.isArray(index);
      for (var i = 0, length = element.length; i < length; i++) {
        opt = element.options[i];
        value = this.optionValue(opt);
        if (single) {
          if (value == index) {
            opt.selected = true;
            return;
          }
        }
        else opt.selected = index.include(value);
      }
    }
  },

  selectOne: function(element) {
    var index = element.selectedIndex;
    return index >= 0 ? this.optionValue(element.options[index]) : null;
  },

  selectMany: function(element) {
    var values, length = element.length;
    if (!length) return null;

    for (var i = 0, values = []; i < length; i++) {
      var opt = element.options[i];
      if (opt.selected) values.push(this.optionValue(opt));
    }
    return values;
  },

  optionValue: function(opt) {
    // extend element because hasAttribute may not be native
    return Element.extend(opt).hasAttribute('value') ? opt.value : opt.text;
  }
};

/*--------------------------------------------------------------------------*/

Abstract.TimedObserver = Class.create(PeriodicalExecuter, {
  initialize: function($super, element, frequency, callback) {
    $super(callback, frequency);
    this.element   = $(element);
    this.lastValue = this.getValue();
  },

  execute: function() {
    var value = this.getValue();
    if (Object.isString(this.lastValue) && Object.isString(value) ?
        this.lastValue != value : String(this.lastValue) != String(value)) {
      this.callback(this.element, value);
      this.lastValue = value;
    }
  }
});

Form.Element.Observer = Class.create(Abstract.TimedObserver, {
  getValue: function() {
    return Form.Element.getValue(this.element);
  }
});

Form.Observer = Class.create(Abstract.TimedObserver, {
  getValue: function() {
    return Form.serialize(this.element);
  }
});

/*--------------------------------------------------------------------------*/

Abstract.EventObserver = Class.create({
  initialize: function(element, callback) {
    this.element  = $(element);
    this.callback = callback;

    this.lastValue = this.getValue();
    if (this.element.tagName.toLowerCase() == 'form')
      this.registerFormCallbacks();
    else
      this.registerCallback(this.element);
  },

  onElementEvent: function() {
    var value = this.getValue();
    if (this.lastValue != value) {
      this.callback(this.element, value);
      this.lastValue = value;
    }
  },

  registerFormCallbacks: function() {
    Form.getElements(this.element).each(this.registerCallback, this);
  },

  registerCallback: function(element) {
    if (element.type) {
      switch (element.type.toLowerCase()) {
        case 'checkbox':
        case 'radio':
          Event.observe(element, 'click', this.onElementEvent.bind(this));
          break;
        default:
          Event.observe(element, 'change', this.onElementEvent.bind(this));
          break;
      }
    }
  }
});

Form.Element.EventObserver = Class.create(Abstract.EventObserver, {
  getValue: function() {
    return Form.Element.getValue(this.element);
  }
});

Form.EventObserver = Class.create(Abstract.EventObserver, {
  getValue: function() {
    return Form.serialize(this.element);
  }
});
if (!window.Event) var Event = { };

Object.extend(Event, {
  KEY_BACKSPACE: 8,
  KEY_TAB:       9,
  KEY_RETURN:   13,
  KEY_ESC:      27,
  KEY_LEFT:     37,
  KEY_UP:       38,
  KEY_RIGHT:    39,
  KEY_DOWN:     40,
  KEY_DELETE:   46,
  KEY_HOME:     36,
  KEY_END:      35,
  KEY_PAGEUP:   33,
  KEY_PAGEDOWN: 34,
  KEY_INSERT:   45,

  cache: { },

  relatedTarget: function(event) {
    var element;
    switch(event.type) {
      case 'mouseover': element = event.fromElement; break;
      case 'mouseout':  element = event.toElement;   break;
      default: return null;
    }
    return Element.extend(element);
  }
});

Event.Methods = (function() {
  var isButton;

  if (Prototype.Browser.IE) {
    var buttonMap = { 0: 1, 1: 4, 2: 2 };
    isButton = function(event, code) {
      return event.button == buttonMap[code];
    };

  } else if (Prototype.Browser.WebKit) {
    isButton = function(event, code) {
      switch (code) {
        case 0: return event.which == 1 && !event.metaKey;
        case 1: return event.which == 1 && event.metaKey;
        default: return false;
      }
    };

  } else {
    isButton = function(event, code) {
      return event.which ? (event.which === code + 1) : (event.button === code);
    };
  }

  return {
    isLeftClick:   function(event) { return isButton(event, 0) },
    isMiddleClick: function(event) { return isButton(event, 1) },
    isRightClick:  function(event) { return isButton(event, 2) },

    element: function(event) {
      var node = Event.extend(event).target;
      return Element.extend(node.nodeType == Node.TEXT_NODE ? node.parentNode : node);
    },

    findElement: function(event, expression) {
      var element = Event.element(event);
      if (!expression) return element;
      var elements = [element].concat(element.ancestors());
      return Selector.findElement(elements, expression, 0);
    },

    pointer: function(event) {
      return {
        x: event.pageX || (event.clientX +
          (document.documentElement.scrollLeft || document.body.scrollLeft)),
        y: event.pageY || (event.clientY +
          (document.documentElement.scrollTop || document.body.scrollTop))
      };
    },

    pointerX: function(event) { return Event.pointer(event).x },
    pointerY: function(event) { return Event.pointer(event).y },

    stop: function(event) {
      Event.extend(event);
      event.preventDefault();
      event.stopPropagation();
      event.stopped = true;
    }
  };
})();

Event.extend = (function() {
  var methods = Object.keys(Event.Methods).inject({ }, function(m, name) {
    m[name] = Event.Methods[name].methodize();
    return m;
  });

  if (Prototype.Browser.IE) {
    Object.extend(methods, {
      stopPropagation: function() { this.cancelBubble = true },
      preventDefault:  function() { this.returnValue = false },
      inspect: function() { return "[object Event]" }
    });

    return function(event) {
      if (!event) return false;
      if (event._extendedByPrototype) return event;

      event._extendedByPrototype = Prototype.emptyFunction;
      var pointer = Event.pointer(event);
      Object.extend(event, {
        target: event.srcElement,
        relatedTarget: Event.relatedTarget(event),
        pageX:  pointer.x,
        pageY:  pointer.y
      });
      return Object.extend(event, methods);
    };

  } else {
    Event.prototype = Event.prototype || document.createEvent("HTMLEvents").__proto__;
    Object.extend(Event.prototype, methods);
    return Prototype.K;
  }
})();

Object.extend(Event, (function() {
  var cache = Event.cache;

  function getEventID(element) {
    if (element._prototypeEventID) return element._prototypeEventID[0];
    arguments.callee.id = arguments.callee.id || 1;
    return element._prototypeEventID = [++arguments.callee.id];
  }

  function getDOMEventName(eventName) {
    if (eventName && eventName.include(':')) return "dataavailable";
    return eventName;
  }

  function getCacheForID(id) {
    return cache[id] = cache[id] || { };
  }

  function getWrappersForEventName(id, eventName) {
    var c = getCacheForID(id);
    return c[eventName] = c[eventName] || [];
  }

  function createWrapper(element, eventName, handler) {
    var id = getEventID(element);
    var c = getWrappersForEventName(id, eventName);
    if (c.pluck("handler").include(handler)) return false;

    var wrapper = function(event) {
      if (!Event || !Event.extend ||
        (event.eventName && event.eventName != eventName))
          return false;

      Event.extend(event);
      handler.call(element, event);
    };

    wrapper.handler = handler;
    c.push(wrapper);
    return wrapper;
  }

  function findWrapper(id, eventName, handler) {
    var c = getWrappersForEventName(id, eventName);
    return c.find(function(wrapper) { return wrapper.handler == handler });
  }

  function destroyWrapper(id, eventName, handler) {
    var c = getCacheForID(id);
    if (!c[eventName]) return false;
    c[eventName] = c[eventName].without(findWrapper(id, eventName, handler));
  }

  function destroyCache() {
    for (var id in cache)
      for (var eventName in cache[id])
        cache[id][eventName] = null;
  }

  if (window.attachEvent) {
    window.attachEvent("onunload", destroyCache);
  }

  return {
    observe: function(element, eventName, handler) {
      element = $(element);
      var name = getDOMEventName(eventName);

      var wrapper = createWrapper(element, eventName, handler);
      if (!wrapper) return element;

      if (element.addEventListener) {
        element.addEventListener(name, wrapper, false);
      } else {
        element.attachEvent("on" + name, wrapper);
      }

      return element;
    },

    stopObserving: function(element, eventName, handler) {
      element = $(element);
      var id = getEventID(element), name = getDOMEventName(eventName);

      if (!handler && eventName) {
        getWrappersForEventName(id, eventName).each(function(wrapper) {
          element.stopObserving(eventName, wrapper.handler);
        });
        return element;

      } else if (!eventName) {
        Object.keys(getCacheForID(id)).each(function(eventName) {
          element.stopObserving(eventName);
        });
        return element;
      }

      var wrapper = findWrapper(id, eventName, handler);
      if (!wrapper) return element;

      if (element.removeEventListener) {
        element.removeEventListener(name, wrapper, false);
      } else {
        element.detachEvent("on" + name, wrapper);
      }

      destroyWrapper(id, eventName, handler);

      return element;
    },

    fire: function(element, eventName, memo) {
      element = $(element);
      if (element == document && document.createEvent && !element.dispatchEvent)
        element = document.documentElement;

      var event;
      if (document.createEvent) {
        event = document.createEvent("HTMLEvents");
        event.initEvent("dataavailable", true, true);
      } else {
        event = document.createEventObject();
        event.eventType = "ondataavailable";
      }

      event.eventName = eventName;
      event.memo = memo || { };

      if (document.createEvent) {
        element.dispatchEvent(event);
      } else {
        element.fireEvent(event.eventType, event);
      }

      return Event.extend(event);
    }
  };
})());

Object.extend(Event, Event.Methods);

Element.addMethods({
  fire:          Event.fire,
  observe:       Event.observe,
  stopObserving: Event.stopObserving
});

Object.extend(document, {
  fire:          Element.Methods.fire.methodize(),
  observe:       Element.Methods.observe.methodize(),
  stopObserving: Element.Methods.stopObserving.methodize(),
  loaded:        false
});

(function() {
  /* Support for the DOMContentLoaded event is based on work by Dan Webb,
     Matthias Miller, Dean Edwards and John Resig. */

  var timer;

  function fireContentLoadedEvent() {
    if (document.loaded) return;
    if (timer) window.clearInterval(timer);
    document.fire("dom:loaded");
    document.loaded = true;
  }

  if (document.addEventListener) {
    if (Prototype.Browser.WebKit) {
      timer = window.setInterval(function() {
        if (/loaded|complete/.test(document.readyState))
          fireContentLoadedEvent();
      }, 0);

      Event.observe(window, "load", fireContentLoadedEvent);

    } else {
      document.addEventListener("DOMContentLoaded",
        fireContentLoadedEvent, false);
    }

  } else {
    document.write("<script id=__onDOMContentLoaded defer src=//:><\/script>");
    $("__onDOMContentLoaded").onreadystatechange = function() {
      if (this.readyState == "complete") {
        this.onreadystatechange = null;
        fireContentLoadedEvent();
      }
    };
  }
})();
/*------------------------------- DEPRECATED -------------------------------*/

Hash.toQueryString = Object.toQueryString;

var Toggle = { display: Element.toggle };

Element.Methods.childOf = Element.Methods.descendantOf;

var Insertion = {
  Before: function(element, content) {
    return Element.insert(element, {before:content});
  },

  Top: function(element, content) {
    return Element.insert(element, {top:content});
  },

  Bottom: function(element, content) {
    return Element.insert(element, {bottom:content});
  },

  After: function(element, content) {
    return Element.insert(element, {after:content});
  }
};

var $continue = new Error('"throw $continue" is deprecated, use "return" instead');

// This should be moved to script.aculo.us; notice the deprecated methods
// further below, that map to the newer Element methods.
var Position = {
  // set to true if needed, warning: firefox performance problems
  // NOT neeeded for page scrolling, only if draggable contained in
  // scrollable elements
  includeScrollOffsets: false,

  // must be called before calling withinIncludingScrolloffset, every time the
  // page is scrolled
  prepare: function() {
    this.deltaX =  window.pageXOffset
                || document.documentElement.scrollLeft
                || document.body.scrollLeft
                || 0;
    this.deltaY =  window.pageYOffset
                || document.documentElement.scrollTop
                || document.body.scrollTop
                || 0;
  },

  // caches x/y coordinate pair to use with overlap
  within: function(element, x, y) {
    if (this.includeScrollOffsets)
      return this.withinIncludingScrolloffsets(element, x, y);
    this.xcomp = x;
    this.ycomp = y;
    this.offset = Element.cumulativeOffset(element);

    return (y >= this.offset[1] &&
            y <  this.offset[1] + element.offsetHeight &&
            x >= this.offset[0] &&
            x <  this.offset[0] + element.offsetWidth);
  },

  withinIncludingScrolloffsets: function(element, x, y) {
    var offsetcache = Element.cumulativeScrollOffset(element);

    this.xcomp = x + offsetcache[0] - this.deltaX;
    this.ycomp = y + offsetcache[1] - this.deltaY;
    this.offset = Element.cumulativeOffset(element);

    return (this.ycomp >= this.offset[1] &&
            this.ycomp <  this.offset[1] + element.offsetHeight &&
            this.xcomp >= this.offset[0] &&
            this.xcomp <  this.offset[0] + element.offsetWidth);
  },

  // within must be called directly before
  overlap: function(mode, element) {
    if (!mode) return 0;
    if (mode == 'vertical')
      return ((this.offset[1] + element.offsetHeight) - this.ycomp) /
        element.offsetHeight;
    if (mode == 'horizontal')
      return ((this.offset[0] + element.offsetWidth) - this.xcomp) /
        element.offsetWidth;
  },

  // Deprecation layer -- use newer Element methods now (1.5.2).

  cumulativeOffset: Element.Methods.cumulativeOffset,

  positionedOffset: Element.Methods.positionedOffset,

  absolutize: function(element) {
    Position.prepare();
    return Element.absolutize(element);
  },

  relativize: function(element) {
    Position.prepare();
    return Element.relativize(element);
  },

  realOffset: Element.Methods.cumulativeScrollOffset,

  offsetParent: Element.Methods.getOffsetParent,

  page: Element.Methods.viewportOffset,

  clone: function(source, target, options) {
    options = options || { };
    return Element.clonePosition(target, source, options);
  }
};

/*--------------------------------------------------------------------------*/

if (!document.getElementsByClassName) document.getElementsByClassName = function(instanceMethods){
  function iter(name) {
    return name.blank() ? null : "[contains(concat(' ', @class, ' '), ' " + name + " ')]";
  }

  instanceMethods.getElementsByClassName = Prototype.BrowserFeatures.XPath ?
  function(element, className) {
    className = className.toString().strip();
    var cond = /\s/.test(className) ? $w(className).map(iter).join('') : iter(className);
    return cond ? document._getElementsByXPath('.//*' + cond, element) : [];
  } : function(element, className) {
    className = className.toString().strip();
    var elements = [], classNames = (/\s/.test(className) ? $w(className) : null);
    if (!classNames && !className) return elements;

    var nodes = $(element).getElementsByTagName('*');
    className = ' ' + className + ' ';

    for (var i = 0, child, cn; child = nodes[i]; i++) {
      if (child.className && (cn = ' ' + child.className + ' ') && (cn.include(className) ||
          (classNames && classNames.all(function(name) {
            return !name.toString().blank() && cn.include(' ' + name + ' ');
          }))))
        elements.push(Element.extend(child));
    }
    return elements;
  };

  return function(className, parentElement) {
    return $(parentElement || document.body).getElementsByClassName(className);
  };
}(Element.Methods);

/*--------------------------------------------------------------------------*/

Element.ClassNames = Class.create();
Element.ClassNames.prototype = {
  initialize: function(element) {
    this.element = $(element);
  },

  _each: function(iterator) {
    this.element.className.split(/\s+/).select(function(name) {
      return name.length > 0;
    })._each(iterator);
  },

  set: function(className) {
    this.element.className = className;
  },

  add: function(classNameToAdd) {
    if (this.include(classNameToAdd)) return;
    this.set($A(this).concat(classNameToAdd).join(' '));
  },

  remove: function(classNameToRemove) {
    if (!this.include(classNameToRemove)) return;
    this.set($A(this).without(classNameToRemove).join(' '));
  },

  toString: function() {
    return $A(this).join(' ');
  }
};

Object.extend(Element.ClassNames.prototype, Enumerable);

/*--------------------------------------------------------------------------*/

Element.addMethods();

// script.aculo.us effects.js v1.8.1, Thu Jan 03 22:07:12 -0500 2008

// Copyright (c) 2005-2007 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
// Contributors:
//  Justin Palmer (http://encytemedia.com/)
//  Mark Pilgrim (http://diveintomark.org/)
//  Martin Bialasinki
// 
// script.aculo.us is freely distributable under the terms of an MIT-style license.
// For details, see the script.aculo.us web site: http://script.aculo.us/ 

// converts rgb() and #xxx to #xxxxxx format,  
// returns self (or first argument) if not convertable  
String.prototype.parseColor = function() {  
  var color = '#';
  if (this.slice(0,4) == 'rgb(') {  
    var cols = this.slice(4,this.length-1).split(',');  
    var i=0; do { color += parseInt(cols[i]).toColorPart() } while (++i<3);  
  } else {  
    if (this.slice(0,1) == '#') {  
      if (this.length==4) for(var i=1;i<4;i++) color += (this.charAt(i) + this.charAt(i)).toLowerCase();  
      if (this.length==7) color = this.toLowerCase();  
    }  
  }  
  return (color.length==7 ? color : (arguments[0] || this));  
};

/*--------------------------------------------------------------------------*/

Element.collectTextNodes = function(element) {  
  return $A($(element).childNodes).collect( function(node) {
    return (node.nodeType==3 ? node.nodeValue : 
      (node.hasChildNodes() ? Element.collectTextNodes(node) : ''));
  }).flatten().join('');
};

Element.collectTextNodesIgnoreClass = function(element, className) {  
  return $A($(element).childNodes).collect( function(node) {
    return (node.nodeType==3 ? node.nodeValue : 
      ((node.hasChildNodes() && !Element.hasClassName(node,className)) ? 
        Element.collectTextNodesIgnoreClass(node, className) : ''));
  }).flatten().join('');
};

Element.setContentZoom = function(element, percent) {
  element = $(element);  
  element.setStyle({fontSize: (percent/100) + 'em'});   
  if (Prototype.Browser.WebKit) window.scrollBy(0,0);
  return element;
};

Element.getInlineOpacity = function(element){
  return $(element).style.opacity || '';
};

Element.forceRerendering = function(element) {
  try {
    element = $(element);
    var n = document.createTextNode(' ');
    element.appendChild(n);
    element.removeChild(n);
  } catch(e) { }
};

/*--------------------------------------------------------------------------*/

var Effect = {
  _elementDoesNotExistError: {
    name: 'ElementDoesNotExistError',
    message: 'The specified DOM element does not exist, but is required for this effect to operate'
  },
  Transitions: {
    linear: Prototype.K,
    sinoidal: function(pos) {
      return (-Math.cos(pos*Math.PI)/2) + 0.5;
    },
    reverse: function(pos) {
      return 1-pos;
    },
    flicker: function(pos) {
      var pos = ((-Math.cos(pos*Math.PI)/4) + 0.75) + Math.random()/4;
      return pos > 1 ? 1 : pos;
    },
    wobble: function(pos) {
      return (-Math.cos(pos*Math.PI*(9*pos))/2) + 0.5;
    },
    pulse: function(pos, pulses) { 
      pulses = pulses || 5; 
      return (
        ((pos % (1/pulses)) * pulses).round() == 0 ? 
              ((pos * pulses * 2) - (pos * pulses * 2).floor()) : 
          1 - ((pos * pulses * 2) - (pos * pulses * 2).floor())
        );
    },
    spring: function(pos) { 
      return 1 - (Math.cos(pos * 4.5 * Math.PI) * Math.exp(-pos * 6)); 
    },
    none: function(pos) {
      return 0;
    },
    full: function(pos) {
      return 1;
    }
  },
  DefaultOptions: {
    duration:   1.0,   // seconds
    fps:        100,   // 100= assume 66fps max.
    sync:       false, // true for combining
    from:       0.0,
    to:         1.0,
    delay:      0.0,
    queue:      'parallel'
  },
  tagifyText: function(element) {
    var tagifyStyle = 'position:relative';
    if (Prototype.Browser.IE) tagifyStyle += ';zoom:1';
    
    element = $(element);
    $A(element.childNodes).each( function(child) {
      if (child.nodeType==3) {
        child.nodeValue.toArray().each( function(character) {
          element.insertBefore(
            new Element('span', {style: tagifyStyle}).update(
              character == ' ' ? String.fromCharCode(160) : character), 
              child);
        });
        Element.remove(child);
      }
    });
  },
  multiple: function(element, effect) {
    var elements;
    if (((typeof element == 'object') || 
        Object.isFunction(element)) && 
       (element.length))
      elements = element;
    else
      elements = $(element).childNodes;
      
    var options = Object.extend({
      speed: 0.1,
      delay: 0.0
    }, arguments[2] || { });
    var masterDelay = options.delay;

    $A(elements).each( function(element, index) {
      new effect(element, Object.extend(options, { delay: index * options.speed + masterDelay }));
    });
  },
  PAIRS: {
    'slide':  ['SlideDown','SlideUp'],
    'blind':  ['BlindDown','BlindUp'],
    'appear': ['Appear','Fade']
  },
  toggle: function(element, effect) {
    element = $(element);
    effect = (effect || 'appear').toLowerCase();
    var options = Object.extend({
      queue: { position:'end', scope:(element.id || 'global'), limit: 1 }
    }, arguments[2] || { });
    Effect[element.visible() ? 
      Effect.PAIRS[effect][1] : Effect.PAIRS[effect][0]](element, options);
  }
};

Effect.DefaultOptions.transition = Effect.Transitions.sinoidal;

/* ------------- core effects ------------- */

Effect.ScopedQueue = Class.create(Enumerable, {
  initialize: function() {
    this.effects  = [];
    this.interval = null;    
  },
  _each: function(iterator) {
    this.effects._each(iterator);
  },
  add: function(effect) {
    var timestamp = new Date().getTime();
    
    var position = Object.isString(effect.options.queue) ? 
      effect.options.queue : effect.options.queue.position;
    
    switch(position) {
      case 'front':
        // move unstarted effects after this effect  
        this.effects.findAll(function(e){ return e.state=='idle' }).each( function(e) {
            e.startOn  += effect.finishOn;
            e.finishOn += effect.finishOn;
          });
        break;
      case 'with-last':
        timestamp = this.effects.pluck('startOn').max() || timestamp;
        break;
      case 'end':
        // start effect after last queued effect has finished
        timestamp = this.effects.pluck('finishOn').max() || timestamp;
        break;
    }
    
    effect.startOn  += timestamp;
    effect.finishOn += timestamp;

    if (!effect.options.queue.limit || (this.effects.length < effect.options.queue.limit))
      this.effects.push(effect);
    
    if (!this.interval)
      this.interval = setInterval(this.loop.bind(this), 15);
  },
  remove: function(effect) {
    this.effects = this.effects.reject(function(e) { return e==effect });
    if (this.effects.length == 0) {
      clearInterval(this.interval);
      this.interval = null;
    }
  },
  loop: function() {
    var timePos = new Date().getTime();
    for(var i=0, len=this.effects.length;i<len;i++) 
      this.effects[i] && this.effects[i].loop(timePos);
  }
});

Effect.Queues = {
  instances: $H(),
  get: function(queueName) {
    if (!Object.isString(queueName)) return queueName;
    
    return this.instances.get(queueName) ||
      this.instances.set(queueName, new Effect.ScopedQueue());
  }
};
Effect.Queue = Effect.Queues.get('global');

Effect.Base = Class.create({
  position: null,
  start: function(options) {
    function codeForEvent(options,eventName){
      return (
        (options[eventName+'Internal'] ? 'this.options.'+eventName+'Internal(this);' : '') +
        (options[eventName] ? 'this.options.'+eventName+'(this);' : '')
      );
    }
    if (options && options.transition === false) options.transition = Effect.Transitions.linear;
    this.options      = Object.extend(Object.extend({ },Effect.DefaultOptions), options || { });
    this.currentFrame = 0;
    this.state        = 'idle';
    this.startOn      = this.options.delay*1000;
    this.finishOn     = this.startOn+(this.options.duration*1000);
    this.fromToDelta  = this.options.to-this.options.from;
    this.totalTime    = this.finishOn-this.startOn;
    this.totalFrames  = this.options.fps*this.options.duration;
    
    eval('this.render = function(pos){ '+
      'if (this.state=="idle"){this.state="running";'+
      codeForEvent(this.options,'beforeSetup')+
      (this.setup ? 'this.setup();':'')+ 
      codeForEvent(this.options,'afterSetup')+
      '};if (this.state=="running"){'+
      'pos=this.options.transition(pos)*'+this.fromToDelta+'+'+this.options.from+';'+
      'this.position=pos;'+
      codeForEvent(this.options,'beforeUpdate')+
      (this.update ? 'this.update(pos);':'')+
      codeForEvent(this.options,'afterUpdate')+
      '}}');
    
    this.event('beforeStart');
    if (!this.options.sync)
      Effect.Queues.get(Object.isString(this.options.queue) ? 
        'global' : this.options.queue.scope).add(this);
  },
  loop: function(timePos) {
    if (timePos >= this.startOn) {
      if (timePos >= this.finishOn) {
        this.render(1.0);
        this.cancel();
        this.event('beforeFinish');
        if (this.finish) this.finish(); 
        this.event('afterFinish');
        return;  
      }
      var pos   = (timePos - this.startOn) / this.totalTime,
          frame = (pos * this.totalFrames).round();
      if (frame > this.currentFrame) {
        this.render(pos);
        this.currentFrame = frame;
      }
    }
  },
  cancel: function() {
    if (!this.options.sync)
      Effect.Queues.get(Object.isString(this.options.queue) ? 
        'global' : this.options.queue.scope).remove(this);
    this.state = 'finished';
  },
  event: function(eventName) {
    if (this.options[eventName + 'Internal']) this.options[eventName + 'Internal'](this);
    if (this.options[eventName]) this.options[eventName](this);
  },
  inspect: function() {
    var data = $H();
    for(property in this)
      if (!Object.isFunction(this[property])) data.set(property, this[property]);
    return '#<Effect:' + data.inspect() + ',options:' + $H(this.options).inspect() + '>';
  }
});

Effect.Parallel = Class.create(Effect.Base, {
  initialize: function(effects) {
    this.effects = effects || [];
    this.start(arguments[1]);
  },
  update: function(position) {
    this.effects.invoke('render', position);
  },
  finish: function(position) {
    this.effects.each( function(effect) {
      effect.render(1.0);
      effect.cancel();
      effect.event('beforeFinish');
      if (effect.finish) effect.finish(position);
      effect.event('afterFinish');
    });
  }
});

Effect.Tween = Class.create(Effect.Base, {
  initialize: function(object, from, to) {
    object = Object.isString(object) ? $(object) : object;
    var args = $A(arguments), method = args.last(), 
      options = args.length == 5 ? args[3] : null;
    this.method = Object.isFunction(method) ? method.bind(object) :
      Object.isFunction(object[method]) ? object[method].bind(object) : 
      function(value) { object[method] = value };
    this.start(Object.extend({ from: from, to: to }, options || { }));
  },
  update: function(position) {
    this.method(position);
  }
});

Effect.Event = Class.create(Effect.Base, {
  initialize: function() {
    this.start(Object.extend({ duration: 0 }, arguments[0] || { }));
  },
  update: Prototype.emptyFunction
});

Effect.Opacity = Class.create(Effect.Base, {
  initialize: function(element) {
    this.element = $(element);
    if (!this.element) throw(Effect._elementDoesNotExistError);
    // make this work on IE on elements without 'layout'
    if (Prototype.Browser.IE && (!this.element.currentStyle.hasLayout))
      this.element.setStyle({zoom: 1});
    var options = Object.extend({
      from: this.element.getOpacity() || 0.0,
      to:   1.0
    }, arguments[1] || { });
    this.start(options);
  },
  update: function(position) {
    this.element.setOpacity(position);
  }
});

Effect.Move = Class.create(Effect.Base, {
  initialize: function(element) {
    this.element = $(element);
    if (!this.element) throw(Effect._elementDoesNotExistError);
    var options = Object.extend({
      x:    0,
      y:    0,
      mode: 'relative'
    }, arguments[1] || { });
    this.start(options);
  },
  setup: function() {
    this.element.makePositioned();
    this.originalLeft = parseFloat(this.element.getStyle('left') || '0');
    this.originalTop  = parseFloat(this.element.getStyle('top')  || '0');
    if (this.options.mode == 'absolute') {
      this.options.x = this.options.x - this.originalLeft;
      this.options.y = this.options.y - this.originalTop;
    }
  },
  update: function(position) {
    this.element.setStyle({
      left: (this.options.x  * position + this.originalLeft).round() + 'px',
      top:  (this.options.y  * position + this.originalTop).round()  + 'px'
    });
  }
});

// for backwards compatibility
Effect.MoveBy = function(element, toTop, toLeft) {
  return new Effect.Move(element, 
    Object.extend({ x: toLeft, y: toTop }, arguments[3] || { }));
};

Effect.Scale = Class.create(Effect.Base, {
  initialize: function(element, percent) {
    this.element = $(element);
    if (!this.element) throw(Effect._elementDoesNotExistError);
    var options = Object.extend({
      scaleX: true,
      scaleY: true,
      scaleContent: true,
      scaleFromCenter: false,
      scaleMode: 'box',        // 'box' or 'contents' or { } with provided values
      scaleFrom: 100.0,
      scaleTo:   percent
    }, arguments[2] || { });
    this.start(options);
  },
  setup: function() {
    this.restoreAfterFinish = this.options.restoreAfterFinish || false;
    this.elementPositioning = this.element.getStyle('position');
    
    this.originalStyle = { };
    ['top','left','width','height','fontSize'].each( function(k) {
      this.originalStyle[k] = this.element.style[k];
    }.bind(this));
      
    this.originalTop  = this.element.offsetTop;
    this.originalLeft = this.element.offsetLeft;
    
    var fontSize = this.element.getStyle('font-size') || '100%';
    ['em','px','%','pt'].each( function(fontSizeType) {
      if (fontSize.indexOf(fontSizeType)>0) {
        this.fontSize     = parseFloat(fontSize);
        this.fontSizeType = fontSizeType;
      }
    }.bind(this));
    
    this.factor = (this.options.scaleTo - this.options.scaleFrom)/100;
    
    this.dims = null;
    if (this.options.scaleMode=='box')
      this.dims = [this.element.offsetHeight, this.element.offsetWidth];
    if (/^content/.test(this.options.scaleMode))
      this.dims = [this.element.scrollHeight, this.element.scrollWidth];
    if (!this.dims)
      this.dims = [this.options.scaleMode.originalHeight,
                   this.options.scaleMode.originalWidth];
  },
  update: function(position) {
    var currentScale = (this.options.scaleFrom/100.0) + (this.factor * position);
    if (this.options.scaleContent && this.fontSize)
      this.element.setStyle({fontSize: this.fontSize * currentScale + this.fontSizeType });
    this.setDimensions(this.dims[0] * currentScale, this.dims[1] * currentScale);
  },
  finish: function(position) {
    if (this.restoreAfterFinish) this.element.setStyle(this.originalStyle);
  },
  setDimensions: function(height, width) {
    var d = { };
    if (this.options.scaleX) d.width = width.round() + 'px';
    if (this.options.scaleY) d.height = height.round() + 'px';
    if (this.options.scaleFromCenter) {
      var topd  = (height - this.dims[0])/2;
      var leftd = (width  - this.dims[1])/2;
      if (this.elementPositioning == 'absolute') {
        if (this.options.scaleY) d.top = this.originalTop-topd + 'px';
        if (this.options.scaleX) d.left = this.originalLeft-leftd + 'px';
      } else {
        if (this.options.scaleY) d.top = -topd + 'px';
        if (this.options.scaleX) d.left = -leftd + 'px';
      }
    }
    this.element.setStyle(d);
  }
});

Effect.Highlight = Class.create(Effect.Base, {
  initialize: function(element) {
    this.element = $(element);
    if (!this.element) throw(Effect._elementDoesNotExistError);
    var options = Object.extend({ startcolor: '#ffff99' }, arguments[1] || { });
    this.start(options);
  },
  setup: function() {
    // Prevent executing on elements not in the layout flow
    if (this.element.getStyle('display')=='none') { this.cancel(); return; }
    // Disable background image during the effect
    this.oldStyle = { };
    if (!this.options.keepBackgroundImage) {
      this.oldStyle.backgroundImage = this.element.getStyle('background-image');
      this.element.setStyle({backgroundImage: 'none'});
    }
    if (!this.options.endcolor)
      this.options.endcolor = this.element.getStyle('background-color').parseColor('#ffffff');
    if (!this.options.restorecolor)
      this.options.restorecolor = this.element.getStyle('background-color');
    // init color calculations
    this._base  = $R(0,2).map(function(i){ return parseInt(this.options.startcolor.slice(i*2+1,i*2+3),16) }.bind(this));
    this._delta = $R(0,2).map(function(i){ return parseInt(this.options.endcolor.slice(i*2+1,i*2+3),16)-this._base[i] }.bind(this));
  },
  update: function(position) {
    this.element.setStyle({backgroundColor: $R(0,2).inject('#',function(m,v,i){
      return m+((this._base[i]+(this._delta[i]*position)).round().toColorPart()); }.bind(this)) });
  },
  finish: function() {
    this.element.setStyle(Object.extend(this.oldStyle, {
      backgroundColor: this.options.restorecolor
    }));
  }
});

Effect.ScrollTo = function(element) {
  var options = arguments[1] || { },
    scrollOffsets = document.viewport.getScrollOffsets(),
    elementOffsets = $(element).cumulativeOffset(),
    max = (window.height || document.body.scrollHeight) - document.viewport.getHeight();  

  if (options.offset) elementOffsets[1] += options.offset;

  return new Effect.Tween(null,
    scrollOffsets.top,
    elementOffsets[1] > max ? max : elementOffsets[1],
    options,
    function(p){ scrollTo(scrollOffsets.left, p.round()) }
  );
};

/* ------------- combination effects ------------- */

Effect.Fade = function(element) {
  element = $(element);
  var oldOpacity = element.getInlineOpacity();
  var options = Object.extend({
    from: element.getOpacity() || 1.0,
    to:   0.0,
    afterFinishInternal: function(effect) { 
      if (effect.options.to!=0) return;
      effect.element.hide().setStyle({opacity: oldOpacity}); 
    }
  }, arguments[1] || { });
  return new Effect.Opacity(element,options);
};

Effect.Appear = function(element) {
  element = $(element);
  var options = Object.extend({
  from: (element.getStyle('display') == 'none' ? 0.0 : element.getOpacity() || 0.0),
  to:   1.0,
  // force Safari to render floated elements properly
  afterFinishInternal: function(effect) {
    effect.element.forceRerendering();
  },
  beforeSetup: function(effect) {
    effect.element.setOpacity(effect.options.from).show(); 
  }}, arguments[1] || { });
  return new Effect.Opacity(element,options);
};

Effect.Puff = function(element) {
  element = $(element);
  var oldStyle = { 
    opacity: element.getInlineOpacity(), 
    position: element.getStyle('position'),
    top:  element.style.top,
    left: element.style.left,
    width: element.style.width,
    height: element.style.height
  };
  return new Effect.Parallel(
   [ new Effect.Scale(element, 200, 
      { sync: true, scaleFromCenter: true, scaleContent: true, restoreAfterFinish: true }), 
     new Effect.Opacity(element, { sync: true, to: 0.0 } ) ], 
     Object.extend({ duration: 1.0, 
      beforeSetupInternal: function(effect) {
        Position.absolutize(effect.effects[0].element)
      },
      afterFinishInternal: function(effect) {
         effect.effects[0].element.hide().setStyle(oldStyle); }
     }, arguments[1] || { })
   );
};

Effect.BlindUp = function(element) {
  element = $(element);
  element.makeClipping();
  return new Effect.Scale(element, 0,
    Object.extend({ scaleContent: false, 
      scaleX: false, 
      restoreAfterFinish: true,
      afterFinishInternal: function(effect) {
        effect.element.hide().undoClipping();
      } 
    }, arguments[1] || { })
  );
};

Effect.BlindDown = function(element) {
  element = $(element);
  var elementDimensions = element.getDimensions();
  return new Effect.Scale(element, 100, Object.extend({ 
    scaleContent: false, 
    scaleX: false,
    scaleFrom: 0,
    scaleMode: {originalHeight: elementDimensions.height, originalWidth: elementDimensions.width},
    restoreAfterFinish: true,
    afterSetup: function(effect) {
      effect.element.makeClipping().setStyle({height: '0px'}).show(); 
    },  
    afterFinishInternal: function(effect) {
      effect.element.undoClipping();
    }
  }, arguments[1] || { }));
};

Effect.SwitchOff = function(element) {
  element = $(element);
  var oldOpacity = element.getInlineOpacity();
  return new Effect.Appear(element, Object.extend({
    duration: 0.4,
    from: 0,
    transition: Effect.Transitions.flicker,
    afterFinishInternal: function(effect) {
      new Effect.Scale(effect.element, 1, { 
        duration: 0.3, scaleFromCenter: true,
        scaleX: false, scaleContent: false, restoreAfterFinish: true,
        beforeSetup: function(effect) { 
          effect.element.makePositioned().makeClipping();
        },
        afterFinishInternal: function(effect) {
          effect.element.hide().undoClipping().undoPositioned().setStyle({opacity: oldOpacity});
        }
      })
    }
  }, arguments[1] || { }));
};

Effect.DropOut = function(element) {
  element = $(element);
  var oldStyle = {
    top: element.getStyle('top'),
    left: element.getStyle('left'),
    opacity: element.getInlineOpacity() };
  return new Effect.Parallel(
    [ new Effect.Move(element, {x: 0, y: 100, sync: true }), 
      new Effect.Opacity(element, { sync: true, to: 0.0 }) ],
    Object.extend(
      { duration: 0.5,
        beforeSetup: function(effect) {
          effect.effects[0].element.makePositioned(); 
        },
        afterFinishInternal: function(effect) {
          effect.effects[0].element.hide().undoPositioned().setStyle(oldStyle);
        } 
      }, arguments[1] || { }));
};

Effect.Shake = function(element) {
  element = $(element);
  var options = Object.extend({
    distance: 20,
    duration: 0.5
  }, arguments[1] || {});
  var distance = parseFloat(options.distance);
  var split = parseFloat(options.duration) / 10.0;
  var oldStyle = {
    top: element.getStyle('top'),
    left: element.getStyle('left') };
    return new Effect.Move(element,
      { x:  distance, y: 0, duration: split, afterFinishInternal: function(effect) {
    new Effect.Move(effect.element,
      { x: -distance*2, y: 0, duration: split*2,  afterFinishInternal: function(effect) {
    new Effect.Move(effect.element,
      { x:  distance*2, y: 0, duration: split*2,  afterFinishInternal: function(effect) {
    new Effect.Move(effect.element,
      { x: -distance*2, y: 0, duration: split*2,  afterFinishInternal: function(effect) {
    new Effect.Move(effect.element,
      { x:  distance*2, y: 0, duration: split*2,  afterFinishInternal: function(effect) {
    new Effect.Move(effect.element,
      { x: -distance, y: 0, duration: split, afterFinishInternal: function(effect) {
        effect.element.undoPositioned().setStyle(oldStyle);
  }}) }}) }}) }}) }}) }});
};

Effect.SlideDown = function(element) {
  element = $(element).cleanWhitespace();
  // SlideDown need to have the content of the element wrapped in a container element with fixed height!
  var oldInnerBottom = element.down().getStyle('bottom');
  var elementDimensions = element.getDimensions();
  return new Effect.Scale(element, 100, Object.extend({ 
    scaleContent: false, 
    scaleX: false, 
    scaleFrom: window.opera ? 0 : 1,
    scaleMode: {originalHeight: elementDimensions.height, originalWidth: elementDimensions.width},
    restoreAfterFinish: true,
    afterSetup: function(effect) {
      effect.element.makePositioned();
      effect.element.down().makePositioned();
      if (window.opera) effect.element.setStyle({top: ''});
      effect.element.makeClipping().setStyle({height: '0px'}).show(); 
    },
    afterUpdateInternal: function(effect) {
      effect.element.down().setStyle({bottom:
        (effect.dims[0] - effect.element.clientHeight) + 'px' }); 
    },
    afterFinishInternal: function(effect) {
      effect.element.undoClipping().undoPositioned();
      effect.element.down().undoPositioned().setStyle({bottom: oldInnerBottom}); }
    }, arguments[1] || { })
  );
};

Effect.SlideUp = function(element) {
  element = $(element).cleanWhitespace();
  var oldInnerBottom = element.down().getStyle('bottom');
  var elementDimensions = element.getDimensions();
  return new Effect.Scale(element, window.opera ? 0 : 1,
   Object.extend({ scaleContent: false, 
    scaleX: false, 
    scaleMode: 'box',
    scaleFrom: 100,
    scaleMode: {originalHeight: elementDimensions.height, originalWidth: elementDimensions.width},
    restoreAfterFinish: true,
    afterSetup: function(effect) {
      effect.element.makePositioned();
      effect.element.down().makePositioned();
      if (window.opera) effect.element.setStyle({top: ''});
      effect.element.makeClipping().show();
    },  
    afterUpdateInternal: function(effect) {
      effect.element.down().setStyle({bottom:
        (effect.dims[0] - effect.element.clientHeight) + 'px' });
    },
    afterFinishInternal: function(effect) {
      effect.element.hide().undoClipping().undoPositioned();
      effect.element.down().undoPositioned().setStyle({bottom: oldInnerBottom});
    }
   }, arguments[1] || { })
  );
};

// Bug in opera makes the TD containing this element expand for a instance after finish 
Effect.Squish = function(element) {
  return new Effect.Scale(element, window.opera ? 1 : 0, { 
    restoreAfterFinish: true,
    beforeSetup: function(effect) {
      effect.element.makeClipping(); 
    },  
    afterFinishInternal: function(effect) {
      effect.element.hide().undoClipping(); 
    }
  });
};

Effect.Grow = function(element) {
  element = $(element);
  var options = Object.extend({
    direction: 'center',
    moveTransition: Effect.Transitions.sinoidal,
    scaleTransition: Effect.Transitions.sinoidal,
    opacityTransition: Effect.Transitions.full
  }, arguments[1] || { });
  var oldStyle = {
    top: element.style.top,
    left: element.style.left,
    height: element.style.height,
    width: element.style.width,
    opacity: element.getInlineOpacity() };

  var dims = element.getDimensions();    
  var initialMoveX, initialMoveY;
  var moveX, moveY;
  
  switch (options.direction) {
    case 'top-left':
      initialMoveX = initialMoveY = moveX = moveY = 0; 
      break;
    case 'top-right':
      initialMoveX = dims.width;
      initialMoveY = moveY = 0;
      moveX = -dims.width;
      break;
    case 'bottom-left':
      initialMoveX = moveX = 0;
      initialMoveY = dims.height;
      moveY = -dims.height;
      break;
    case 'bottom-right':
      initialMoveX = dims.width;
      initialMoveY = dims.height;
      moveX = -dims.width;
      moveY = -dims.height;
      break;
    case 'center':
      initialMoveX = dims.width / 2;
      initialMoveY = dims.height / 2;
      moveX = -dims.width / 2;
      moveY = -dims.height / 2;
      break;
  }
  
  return new Effect.Move(element, {
    x: initialMoveX,
    y: initialMoveY,
    duration: 0.01, 
    beforeSetup: function(effect) {
      effect.element.hide().makeClipping().makePositioned();
    },
    afterFinishInternal: function(effect) {
      new Effect.Parallel(
        [ new Effect.Opacity(effect.element, { sync: true, to: 1.0, from: 0.0, transition: options.opacityTransition }),
          new Effect.Move(effect.element, { x: moveX, y: moveY, sync: true, transition: options.moveTransition }),
          new Effect.Scale(effect.element, 100, {
            scaleMode: { originalHeight: dims.height, originalWidth: dims.width }, 
            sync: true, scaleFrom: window.opera ? 1 : 0, transition: options.scaleTransition, restoreAfterFinish: true})
        ], Object.extend({
             beforeSetup: function(effect) {
               effect.effects[0].element.setStyle({height: '0px'}).show(); 
             },
             afterFinishInternal: function(effect) {
               effect.effects[0].element.undoClipping().undoPositioned().setStyle(oldStyle); 
             }
           }, options)
      )
    }
  });
};

Effect.Shrink = function(element) {
  element = $(element);
  var options = Object.extend({
    direction: 'center',
    moveTransition: Effect.Transitions.sinoidal,
    scaleTransition: Effect.Transitions.sinoidal,
    opacityTransition: Effect.Transitions.none
  }, arguments[1] || { });
  var oldStyle = {
    top: element.style.top,
    left: element.style.left,
    height: element.style.height,
    width: element.style.width,
    opacity: element.getInlineOpacity() };

  var dims = element.getDimensions();
  var moveX, moveY;
  
  switch (options.direction) {
    case 'top-left':
      moveX = moveY = 0;
      break;
    case 'top-right':
      moveX = dims.width;
      moveY = 0;
      break;
    case 'bottom-left':
      moveX = 0;
      moveY = dims.height;
      break;
    case 'bottom-right':
      moveX = dims.width;
      moveY = dims.height;
      break;
    case 'center':  
      moveX = dims.width / 2;
      moveY = dims.height / 2;
      break;
  }
  
  return new Effect.Parallel(
    [ new Effect.Opacity(element, { sync: true, to: 0.0, from: 1.0, transition: options.opacityTransition }),
      new Effect.Scale(element, window.opera ? 1 : 0, { sync: true, transition: options.scaleTransition, restoreAfterFinish: true}),
      new Effect.Move(element, { x: moveX, y: moveY, sync: true, transition: options.moveTransition })
    ], Object.extend({            
         beforeStartInternal: function(effect) {
           effect.effects[0].element.makePositioned().makeClipping(); 
         },
         afterFinishInternal: function(effect) {
           effect.effects[0].element.hide().undoClipping().undoPositioned().setStyle(oldStyle); }
       }, options)
  );
};

Effect.Pulsate = function(element) {
  element = $(element);
  var options    = arguments[1] || { };
  var oldOpacity = element.getInlineOpacity();
  var transition = options.transition || Effect.Transitions.sinoidal;
  var reverser   = function(pos){ return transition(1-Effect.Transitions.pulse(pos, options.pulses)) };
  reverser.bind(transition);
  return new Effect.Opacity(element, 
    Object.extend(Object.extend({  duration: 2.0, from: 0,
      afterFinishInternal: function(effect) { effect.element.setStyle({opacity: oldOpacity}); }
    }, options), {transition: reverser}));
};

Effect.Fold = function(element) {
  element = $(element);
  var oldStyle = {
    top: element.style.top,
    left: element.style.left,
    width: element.style.width,
    height: element.style.height };
  element.makeClipping();
  return new Effect.Scale(element, 5, Object.extend({   
    scaleContent: false,
    scaleX: false,
    afterFinishInternal: function(effect) {
    new Effect.Scale(element, 1, { 
      scaleContent: false, 
      scaleY: false,
      afterFinishInternal: function(effect) {
        effect.element.hide().undoClipping().setStyle(oldStyle);
      } });
  }}, arguments[1] || { }));
};

Effect.Morph = Class.create(Effect.Base, {
  initialize: function(element) {
    this.element = $(element);
    if (!this.element) throw(Effect._elementDoesNotExistError);
    var options = Object.extend({
      style: { }
    }, arguments[1] || { });
    
    if (!Object.isString(options.style)) this.style = $H(options.style);
    else {
      if (options.style.include(':'))
        this.style = options.style.parseStyle();
      else {
        this.element.addClassName(options.style);
        this.style = $H(this.element.getStyles());
        this.element.removeClassName(options.style);
        var css = this.element.getStyles();
        this.style = this.style.reject(function(style) {
          return style.value == css[style.key];
        });
        options.afterFinishInternal = function(effect) {
          effect.element.addClassName(effect.options.style);
          effect.transforms.each(function(transform) {
            effect.element.style[transform.style] = '';
          });
        }
      }
    }
    this.start(options);
  },
  
  setup: function(){
    function parseColor(color){
      if (!color || ['rgba(0, 0, 0, 0)','transparent'].include(color)) color = '#ffffff';
      color = color.parseColor();
      return $R(0,2).map(function(i){
        return parseInt( color.slice(i*2+1,i*2+3), 16 ) 
      });
    }
    this.transforms = this.style.map(function(pair){
      var property = pair[0], value = pair[1], unit = null;

      if (value.parseColor('#zzzzzz') != '#zzzzzz') {
        value = value.parseColor();
        unit  = 'color';
      } else if (property == 'opacity') {
        value = parseFloat(value);
        if (Prototype.Browser.IE && (!this.element.currentStyle.hasLayout))
          this.element.setStyle({zoom: 1});
      } else if (Element.CSS_LENGTH.test(value)) {
          var components = value.match(/^([\+\-]?[0-9\.]+)(.*)$/);
          value = parseFloat(components[1]);
          unit = (components.length == 3) ? components[2] : null;
      }

      var originalValue = this.element.getStyle(property);
      return { 
        style: property.camelize(), 
        originalValue: unit=='color' ? parseColor(originalValue) : parseFloat(originalValue || 0), 
        targetValue: unit=='color' ? parseColor(value) : value,
        unit: unit
      };
    }.bind(this)).reject(function(transform){
      return (
        (transform.originalValue == transform.targetValue) ||
        (
          transform.unit != 'color' &&
          (isNaN(transform.originalValue) || isNaN(transform.targetValue))
        )
      )
    });
  },
  update: function(position) {
    var style = { }, transform, i = this.transforms.length;
    while(i--)
      style[(transform = this.transforms[i]).style] = 
        transform.unit=='color' ? '#'+
          (Math.round(transform.originalValue[0]+
            (transform.targetValue[0]-transform.originalValue[0])*position)).toColorPart() +
          (Math.round(transform.originalValue[1]+
            (transform.targetValue[1]-transform.originalValue[1])*position)).toColorPart() +
          (Math.round(transform.originalValue[2]+
            (transform.targetValue[2]-transform.originalValue[2])*position)).toColorPart() :
        (transform.originalValue +
          (transform.targetValue - transform.originalValue) * position).toFixed(3) + 
            (transform.unit === null ? '' : transform.unit);
    this.element.setStyle(style, true);
  }
});

Effect.Transform = Class.create({
  initialize: function(tracks){
    this.tracks  = [];
    this.options = arguments[1] || { };
    this.addTracks(tracks);
  },
  addTracks: function(tracks){
    tracks.each(function(track){
      track = $H(track);
      var data = track.values().first();
      this.tracks.push($H({
        ids:     track.keys().first(),
        effect:  Effect.Morph,
        options: { style: data }
      }));
    }.bind(this));
    return this;
  },
  play: function(){
    return new Effect.Parallel(
      this.tracks.map(function(track){
        var ids = track.get('ids'), effect = track.get('effect'), options = track.get('options');
        var elements = [$(ids) || $$(ids)].flatten();
        return elements.map(function(e){ return new effect(e, Object.extend({ sync:true }, options)) });
      }).flatten(),
      this.options
    );
  }
});

Element.CSS_PROPERTIES = $w(
  'backgroundColor backgroundPosition borderBottomColor borderBottomStyle ' + 
  'borderBottomWidth borderLeftColor borderLeftStyle borderLeftWidth ' +
  'borderRightColor borderRightStyle borderRightWidth borderSpacing ' +
  'borderTopColor borderTopStyle borderTopWidth bottom clip color ' +
  'fontSize fontWeight height left letterSpacing lineHeight ' +
  'marginBottom marginLeft marginRight marginTop markerOffset maxHeight '+
  'maxWidth minHeight minWidth opacity outlineColor outlineOffset ' +
  'outlineWidth paddingBottom paddingLeft paddingRight paddingTop ' +
  'right textIndent top width wordSpacing zIndex');
  
Element.CSS_LENGTH = /^(([\+\-]?[0-9\.]+)(em|ex|px|in|cm|mm|pt|pc|\%))|0$/;

String.__parseStyleElement = document.createElement('div');
String.prototype.parseStyle = function(){
  var style, styleRules = $H();
  if (Prototype.Browser.WebKit)
    style = new Element('div',{style:this}).style;
  else {
    String.__parseStyleElement.innerHTML = '<div style="' + this + '"></div>';
    style = String.__parseStyleElement.childNodes[0].style;
  }
  
  Element.CSS_PROPERTIES.each(function(property){
    if (style[property]) styleRules.set(property, style[property]); 
  });
  
  if (Prototype.Browser.IE && this.include('opacity'))
    styleRules.set('opacity', this.match(/opacity:\s*((?:0|1)?(?:\.\d*)?)/)[1]);

  return styleRules;
};

if (document.defaultView && document.defaultView.getComputedStyle) {
  Element.getStyles = function(element) {
    var css = document.defaultView.getComputedStyle($(element), null);
    return Element.CSS_PROPERTIES.inject({ }, function(styles, property) {
      styles[property] = css[property];
      return styles;
    });
  };
} else {
  Element.getStyles = function(element) {
    element = $(element);
    var css = element.currentStyle, styles;
    styles = Element.CSS_PROPERTIES.inject({ }, function(results, property) {
      results[property] = css[property];
      return results;
    });
    if (!styles.opacity) styles.opacity = element.getOpacity();
    return styles;
  };
};

Effect.Methods = {
  morph: function(element, style) {
    element = $(element);
    new Effect.Morph(element, Object.extend({ style: style }, arguments[2] || { }));
    return element;
  },
  visualEffect: function(element, effect, options) {
    element = $(element)
    var s = effect.dasherize().camelize(), klass = s.charAt(0).toUpperCase() + s.substring(1);
    new Effect[klass](element, options);
    return element;
  },
  highlight: function(element, options) {
    element = $(element);
    new Effect.Highlight(element, options);
    return element;
  }
};

$w('fade appear grow shrink fold blindUp blindDown slideUp slideDown '+
  'pulsate shake puff squish switchOff dropOut').each(
  function(effect) { 
    Effect.Methods[effect] = function(element, options){
      element = $(element);
      Effect[effect.charAt(0).toUpperCase() + effect.substring(1)](element, options);
      return element;
    }
  }
);

$w('getInlineOpacity forceRerendering setContentZoom collectTextNodes collectTextNodesIgnoreClass getStyles').each( 
  function(f) { Effect.Methods[f] = Element[f]; }
);

Element.addMethods(Effect.Methods);

// script.aculo.us dragdrop.js v1.8.1, Thu Jan 03 22:07:12 -0500 2008

// Copyright (c) 2005-2007 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
//           (c) 2005-2007 Sammi Williams (http://www.oriontransfer.co.nz, sammi@oriontransfer.co.nz)
// 
// script.aculo.us is freely distributable under the terms of an MIT-style license.
// For details, see the script.aculo.us web site: http://script.aculo.us/

if(Object.isUndefined(Effect))
  throw("dragdrop.js requires including script.aculo.us' effects.js library");

var Droppables = {
  drops: [],

  remove: function(element) {
    this.drops = this.drops.reject(function(d) { return d.element==$(element) });
  },

  add: function(element) {
    element = $(element);
    var options = Object.extend({
      greedy:     true,
      hoverclass: null,
      tree:       false
    }, arguments[1] || { });

    // cache containers
    if(options.containment) {
      options._containers = [];
      var containment = options.containment;
      if(Object.isArray(containment)) {
        containment.each( function(c) { options._containers.push($(c)) });
      } else {
        options._containers.push($(containment));
      }
    }
    
    if(options.accept) options.accept = [options.accept].flatten();

    Element.makePositioned(element); // fix IE
    options.element = element;

    this.drops.push(options);
  },
  
  findDeepestChild: function(drops) {
    deepest = drops[0];
      
    for (i = 1; i < drops.length; ++i)
      if (Element.isParent(drops[i].element, deepest.element))
        deepest = drops[i];
    
    return deepest;
  },

  isContained: function(element, drop) {
    var containmentNode;
    if(drop.tree) {
      containmentNode = element.treeNode; 
    } else {
      containmentNode = element.parentNode;
    }
    return drop._containers.detect(function(c) { return containmentNode == c });
  },
  
  isAffected: function(point, element, drop) {
    return (
      (drop.element!=element) &&
      ((!drop._containers) ||
        this.isContained(element, drop)) &&
      ((!drop.accept) ||
        (Element.classNames(element).detect( 
          function(v) { return drop.accept.include(v) } ) )) &&
      Position.within(drop.element, point[0], point[1]) );
  },

  deactivate: function(drop) {
    if(drop.hoverclass)
      Element.removeClassName(drop.element, drop.hoverclass);
    this.last_active = null;
  },

  activate: function(drop) {
    if(drop.hoverclass)
      Element.addClassName(drop.element, drop.hoverclass);
    this.last_active = drop;
  },

  show: function(point, element) {
    if(!this.drops.length) return;
    var drop, affected = [];
    
    this.drops.each( function(drop) {
      if(Droppables.isAffected(point, element, drop))
        affected.push(drop);
    });
        
    if(affected.length>0)
      drop = Droppables.findDeepestChild(affected);

    if(this.last_active && this.last_active != drop) this.deactivate(this.last_active);
    if (drop) {
      Position.within(drop.element, point[0], point[1]);
      if(drop.onHover)
        drop.onHover(element, drop.element, Position.overlap(drop.overlap, drop.element));
      
      if (drop != this.last_active) Droppables.activate(drop);
    }
  },

  fire: function(event, element) {
    if(!this.last_active) return;
    Position.prepare();

    if (this.isAffected([Event.pointerX(event), Event.pointerY(event)], element, this.last_active))
      if (this.last_active.onDrop) {
        this.last_active.onDrop(element, this.last_active.element, event); 
        return true; 
      }
  },

  reset: function() {
    if(this.last_active)
      this.deactivate(this.last_active);
  }
}

var Draggables = {
  drags: [],
  observers: [],
  
  register: function(draggable) {
    if(this.drags.length == 0) {
      this.eventMouseUp   = this.endDrag.bindAsEventListener(this);
      this.eventMouseMove = this.updateDrag.bindAsEventListener(this);
      this.eventKeypress  = this.keyPress.bindAsEventListener(this);
      
      Event.observe(document, "mouseup", this.eventMouseUp);
      Event.observe(document, "mousemove", this.eventMouseMove);
      Event.observe(document, "keypress", this.eventKeypress);
    }
    this.drags.push(draggable);
  },
  
  unregister: function(draggable) {
    this.drags = this.drags.reject(function(d) { return d==draggable });
    if(this.drags.length == 0) {
      Event.stopObserving(document, "mouseup", this.eventMouseUp);
      Event.stopObserving(document, "mousemove", this.eventMouseMove);
      Event.stopObserving(document, "keypress", this.eventKeypress);
    }
  },
  
  activate: function(draggable) {
    if(draggable.options.delay) { 
      this._timeout = setTimeout(function() { 
        Draggables._timeout = null; 
        window.focus(); 
        Draggables.activeDraggable = draggable; 
      }.bind(this), draggable.options.delay); 
    } else {
      window.focus(); // allows keypress events if window isn't currently focused, fails for Safari
      this.activeDraggable = draggable;
    }
  },
  
  deactivate: function() {
    this.activeDraggable = null;
  },
  
  updateDrag: function(event) {
    if(!this.activeDraggable) return;
    var pointer = [Event.pointerX(event), Event.pointerY(event)];
    // Mozilla-based browsers fire successive mousemove events with
    // the same coordinates, prevent needless redrawing (moz bug?)
    if(this._lastPointer && (this._lastPointer.inspect() == pointer.inspect())) return;
    this._lastPointer = pointer;
    
    this.activeDraggable.updateDrag(event, pointer);
  },
  
  endDrag: function(event) {
    if(this._timeout) { 
      clearTimeout(this._timeout); 
      this._timeout = null; 
    }
    if(!this.activeDraggable) return;
    this._lastPointer = null;
    this.activeDraggable.endDrag(event);
    this.activeDraggable = null;
  },
  
  keyPress: function(event) {
    if(this.activeDraggable)
      this.activeDraggable.keyPress(event);
  },
  
  addObserver: function(observer) {
    this.observers.push(observer);
    this._cacheObserverCallbacks();
  },
  
  removeObserver: function(element) {  // element instead of observer fixes mem leaks
    this.observers = this.observers.reject( function(o) { return o.element==element });
    this._cacheObserverCallbacks();
  },
  
  notify: function(eventName, draggable, event) {  // 'onStart', 'onEnd', 'onDrag'
    if(this[eventName+'Count'] > 0)
      this.observers.each( function(o) {
        if(o[eventName]) o[eventName](eventName, draggable, event);
      });
    if(draggable.options[eventName]) draggable.options[eventName](draggable, event);
  },
  
  _cacheObserverCallbacks: function() {
    ['onStart','onEnd','onDrag'].each( function(eventName) {
      Draggables[eventName+'Count'] = Draggables.observers.select(
        function(o) { return o[eventName]; }
      ).length;
    });
  }
}

/*--------------------------------------------------------------------------*/

var Draggable = Class.create({
  initialize: function(element) {
    var defaults = {
      handle: false,
      reverteffect: function(element, top_offset, left_offset) {
        var dur = Math.sqrt(Math.abs(top_offset^2)+Math.abs(left_offset^2))*0.02;
        new Effect.Move(element, { x: -left_offset, y: -top_offset, duration: dur,
          queue: {scope:'_draggable', position:'end'}
        });
      },
      endeffect: function(element) {
        var toOpacity = Object.isNumber(element._opacity) ? element._opacity : 1.0;
        new Effect.Opacity(element, {duration:0.2, from:0.7, to:toOpacity, 
          queue: {scope:'_draggable', position:'end'},
          afterFinish: function(){ 
            Draggable._dragging[element] = false 
          }
        }); 
      },
      zindex: 1000,
      revert: false,
      quiet: false,
      scroll: false,
      scrollSensitivity: 20,
      scrollSpeed: 15,
      snap: false,  // false, or xy or [x,y] or function(x,y){ return [x,y] }
      delay: 0
    };
    
    if(!arguments[1] || Object.isUndefined(arguments[1].endeffect))
      Object.extend(defaults, {
        starteffect: function(element) {
          element._opacity = Element.getOpacity(element);
          Draggable._dragging[element] = true;
          new Effect.Opacity(element, {duration:0.2, from:element._opacity, to:0.7}); 
        }
      });
    
    var options = Object.extend(defaults, arguments[1] || { });

    this.element = $(element);
    
    if(options.handle && Object.isString(options.handle))
      this.handle = this.element.down('.'+options.handle, 0);
    
    if(!this.handle) this.handle = $(options.handle);
    if(!this.handle) this.handle = this.element;
    
    if(options.scroll && !options.scroll.scrollTo && !options.scroll.outerHTML) {
      options.scroll = $(options.scroll);
      this._isScrollChild = Element.childOf(this.element, options.scroll);
    }

    Element.makePositioned(this.element); // fix IE    

    this.options  = options;
    this.dragging = false;   

    this.eventMouseDown = this.initDrag.bindAsEventListener(this);
    Event.observe(this.handle, "mousedown", this.eventMouseDown);
    
    Draggables.register(this);
  },
  
  destroy: function() {
    Event.stopObserving(this.handle, "mousedown", this.eventMouseDown);
    Draggables.unregister(this);
  },
  
  currentDelta: function() {
    return([
      parseInt(Element.getStyle(this.element,'left') || '0'),
      parseInt(Element.getStyle(this.element,'top') || '0')]);
  },
  
  initDrag: function(event) {
    if(!Object.isUndefined(Draggable._dragging[this.element]) &&
      Draggable._dragging[this.element]) return;
    if(Event.isLeftClick(event)) {    
      // abort on form elements, fixes a Firefox issue
      var src = Event.element(event);
      if((tag_name = src.tagName.toUpperCase()) && (
        tag_name=='INPUT' ||
        tag_name=='SELECT' ||
        tag_name=='OPTION' ||
        tag_name=='BUTTON' ||
        tag_name=='TEXTAREA')) return;
        
      var pointer = [Event.pointerX(event), Event.pointerY(event)];
      var pos     = Position.cumulativeOffset(this.element);
      this.offset = [0,1].map( function(i) { return (pointer[i] - pos[i]) });
      
      Draggables.activate(this);
      Event.stop(event);
    }
  },
  
  startDrag: function(event) {
    this.dragging = true;
    if(!this.delta)
      this.delta = this.currentDelta();
    
    if(this.options.zindex) {
      this.originalZ = parseInt(Element.getStyle(this.element,'z-index') || 0);
      this.element.style.zIndex = this.options.zindex;
    }
    
    if(this.options.ghosting) {
      this._clone = this.element.cloneNode(true);
      this.element._originallyAbsolute = (this.element.getStyle('position') == 'absolute');
      if (!this.element._originallyAbsolute)
        Position.absolutize(this.element);
      this.element.parentNode.insertBefore(this._clone, this.element);
    }
    
    if(this.options.scroll) {
      if (this.options.scroll == window) {
        var where = this._getWindowScroll(this.options.scroll);
        this.originalScrollLeft = where.left;
        this.originalScrollTop = where.top;
      } else {
        this.originalScrollLeft = this.options.scroll.scrollLeft;
        this.originalScrollTop = this.options.scroll.scrollTop;
      }
    }
    
    Draggables.notify('onStart', this, event);
        
    if(this.options.starteffect) this.options.starteffect(this.element);
  },
  
  updateDrag: function(event, pointer) {
    if(!this.dragging) this.startDrag(event);
    
    if(!this.options.quiet){
      Position.prepare();
      Droppables.show(pointer, this.element);
    }
    
    Draggables.notify('onDrag', this, event);
    
    this.draw(pointer);
    if(this.options.change) this.options.change(this);
    
    if(this.options.scroll) {
      this.stopScrolling();
      
      var p;
      if (this.options.scroll == window) {
        with(this._getWindowScroll(this.options.scroll)) { p = [ left, top, left+width, top+height ]; }
      } else {
        p = Position.page(this.options.scroll);
        p[0] += this.options.scroll.scrollLeft + Position.deltaX;
        p[1] += this.options.scroll.scrollTop + Position.deltaY;
        p.push(p[0]+this.options.scroll.offsetWidth);
        p.push(p[1]+this.options.scroll.offsetHeight);
      }
      var speed = [0,0];
      if(pointer[0] < (p[0]+this.options.scrollSensitivity)) speed[0] = pointer[0]-(p[0]+this.options.scrollSensitivity);
      if(pointer[1] < (p[1]+this.options.scrollSensitivity)) speed[1] = pointer[1]-(p[1]+this.options.scrollSensitivity);
      if(pointer[0] > (p[2]-this.options.scrollSensitivity)) speed[0] = pointer[0]-(p[2]-this.options.scrollSensitivity);
      if(pointer[1] > (p[3]-this.options.scrollSensitivity)) speed[1] = pointer[1]-(p[3]-this.options.scrollSensitivity);
      this.startScrolling(speed);
    }
    
    // fix AppleWebKit rendering
    if(Prototype.Browser.WebKit) window.scrollBy(0,0);
    
    Event.stop(event);
  },
  
  finishDrag: function(event, success) {
    this.dragging = false;
    
    if(this.options.quiet){
      Position.prepare();
      var pointer = [Event.pointerX(event), Event.pointerY(event)];
      Droppables.show(pointer, this.element);
    }

    if(this.options.ghosting) {
      if (!this.element._originallyAbsolute)
        Position.relativize(this.element);
      delete this.element._originallyAbsolute;
      Element.remove(this._clone);
      this._clone = null;
    }

    var dropped = false; 
    if(success) { 
      dropped = Droppables.fire(event, this.element); 
      if (!dropped) dropped = false; 
    }
    if(dropped && this.options.onDropped) this.options.onDropped(this.element);
    Draggables.notify('onEnd', this, event);

    var revert = this.options.revert;
    if(revert && Object.isFunction(revert)) revert = revert(this.element);
    
    var d = this.currentDelta();
    if(revert && this.options.reverteffect) {
      if (dropped == 0 || revert != 'failure')
        this.options.reverteffect(this.element,
          d[1]-this.delta[1], d[0]-this.delta[0]);
    } else {
      this.delta = d;
    }

    if(this.options.zindex)
      this.element.style.zIndex = this.originalZ;

    if(this.options.endeffect) 
      this.options.endeffect(this.element);
      
    Draggables.deactivate(this);
    Droppables.reset();
  },
  
  keyPress: function(event) {
    if(event.keyCode!=Event.KEY_ESC) return;
    this.finishDrag(event, false);
    Event.stop(event);
  },
  
  endDrag: function(event) {
    if(!this.dragging) return;
    this.stopScrolling();
    this.finishDrag(event, true);
    Event.stop(event);
  },
  
  draw: function(point) {
    var pos = Position.cumulativeOffset(this.element);
    if(this.options.ghosting) {
      var r   = Position.realOffset(this.element);
      pos[0] += r[0] - Position.deltaX; pos[1] += r[1] - Position.deltaY;
    }
    
    var d = this.currentDelta();
    pos[0] -= d[0]; pos[1] -= d[1];
    
    if(this.options.scroll && (this.options.scroll != window && this._isScrollChild)) {
      pos[0] -= this.options.scroll.scrollLeft-this.originalScrollLeft;
      pos[1] -= this.options.scroll.scrollTop-this.originalScrollTop;
    }
    
    var p = [0,1].map(function(i){ 
      return (point[i]-pos[i]-this.offset[i]) 
    }.bind(this));
    
    if(this.options.snap) {
      if(Object.isFunction(this.options.snap)) {
        p = this.options.snap(p[0],p[1],this);
      } else {
      if(Object.isArray(this.options.snap)) {
        p = p.map( function(v, i) {
          return (v/this.options.snap[i]).round()*this.options.snap[i] }.bind(this))
      } else {
        p = p.map( function(v) {
          return (v/this.options.snap).round()*this.options.snap }.bind(this))
      }
    }}
    
    var style = this.element.style;
    if((!this.options.constraint) || (this.options.constraint=='horizontal'))
      style.left = p[0] + "px";
    if((!this.options.constraint) || (this.options.constraint=='vertical'))
      style.top  = p[1] + "px";
    
    if(style.visibility=="hidden") style.visibility = ""; // fix gecko rendering
  },
  
  stopScrolling: function() {
    if(this.scrollInterval) {
      clearInterval(this.scrollInterval);
      this.scrollInterval = null;
      Draggables._lastScrollPointer = null;
    }
  },
  
  startScrolling: function(speed) {
    if(!(speed[0] || speed[1])) return;
    this.scrollSpeed = [speed[0]*this.options.scrollSpeed,speed[1]*this.options.scrollSpeed];
    this.lastScrolled = new Date();
    this.scrollInterval = setInterval(this.scroll.bind(this), 10);
  },
  
  scroll: function() {
    var current = new Date();
    var delta = current - this.lastScrolled;
    this.lastScrolled = current;
    if(this.options.scroll == window) {
      with (this._getWindowScroll(this.options.scroll)) {
        if (this.scrollSpeed[0] || this.scrollSpeed[1]) {
          var d = delta / 1000;
          this.options.scroll.scrollTo( left + d*this.scrollSpeed[0], top + d*this.scrollSpeed[1] );
        }
      }
    } else {
      this.options.scroll.scrollLeft += this.scrollSpeed[0] * delta / 1000;
      this.options.scroll.scrollTop  += this.scrollSpeed[1] * delta / 1000;
    }
    
    Position.prepare();
    Droppables.show(Draggables._lastPointer, this.element);
    Draggables.notify('onDrag', this);
    if (this._isScrollChild) {
      Draggables._lastScrollPointer = Draggables._lastScrollPointer || $A(Draggables._lastPointer);
      Draggables._lastScrollPointer[0] += this.scrollSpeed[0] * delta / 1000;
      Draggables._lastScrollPointer[1] += this.scrollSpeed[1] * delta / 1000;
      if (Draggables._lastScrollPointer[0] < 0)
        Draggables._lastScrollPointer[0] = 0;
      if (Draggables._lastScrollPointer[1] < 0)
        Draggables._lastScrollPointer[1] = 0;
      this.draw(Draggables._lastScrollPointer);
    }
    
    if(this.options.change) this.options.change(this);
  },
  
  _getWindowScroll: function(w) {
    var T, L, W, H;
    with (w.document) {
      if (w.document.documentElement && documentElement.scrollTop) {
        T = documentElement.scrollTop;
        L = documentElement.scrollLeft;
      } else if (w.document.body) {
        T = body.scrollTop;
        L = body.scrollLeft;
      }
      if (w.innerWidth) {
        W = w.innerWidth;
        H = w.innerHeight;
      } else if (w.document.documentElement && documentElement.clientWidth) {
        W = documentElement.clientWidth;
        H = documentElement.clientHeight;
      } else {
        W = body.offsetWidth;
        H = body.offsetHeight
      }
    }
    return { top: T, left: L, width: W, height: H };
  }
});

Draggable._dragging = { };

/*--------------------------------------------------------------------------*/

var SortableObserver = Class.create({
  initialize: function(element, observer) {
    this.element   = $(element);
    this.observer  = observer;
    this.lastValue = Sortable.serialize(this.element);
  },
  
  onStart: function() {
    this.lastValue = Sortable.serialize(this.element);
  },
  
  onEnd: function() {
    Sortable.unmark();
    if(this.lastValue != Sortable.serialize(this.element))
      this.observer(this.element)
  }
});

var Sortable = {
  SERIALIZE_RULE: /^[^_\-](?:[A-Za-z0-9\-\_]*)[_](.*)$/,
  
  sortables: { },
  
  _findRootElement: function(element) {
    while (element.tagName.toUpperCase() != "BODY") {  
      if(element.id && Sortable.sortables[element.id]) return element;
      element = element.parentNode;
    }
  },

  options: function(element) {
    element = Sortable._findRootElement($(element));
    if(!element) return;
    return Sortable.sortables[element.id];
  },
  
  destroy: function(element){
    var s = Sortable.options(element);
    
    if(s) {
      Draggables.removeObserver(s.element);
      s.droppables.each(function(d){ Droppables.remove(d) });
      s.draggables.invoke('destroy');
      
      delete Sortable.sortables[s.element.id];
    }
  },

  create: function(element) {
    element = $(element);
    var options = Object.extend({ 
      element:     element,
      tag:         'li',       // assumes li children, override with tag: 'tagname'
      dropOnEmpty: false,
      tree:        false,
      treeTag:     'ul',
      overlap:     'vertical', // one of 'vertical', 'horizontal'
      constraint:  'vertical', // one of 'vertical', 'horizontal', false
      containment: element,    // also takes array of elements (or id's); or false
      handle:      false,      // or a CSS class
      only:        false,
      delay:       0,
      hoverclass:  null,
      ghosting:    false,
      quiet:       false, 
      scroll:      false,
      scrollSensitivity: 20,
      scrollSpeed: 15,
      format:      this.SERIALIZE_RULE,
      
      // these take arrays of elements or ids and can be 
      // used for better initialization performance
      elements:    false,
      handles:     false,
      
      onChange:    Prototype.emptyFunction,
      onUpdate:    Prototype.emptyFunction
    }, arguments[1] || { });

    // clear any old sortable with same element
    this.destroy(element);

    // build options for the draggables
    var options_for_draggable = {
      revert:      true,
      quiet:       options.quiet,
      scroll:      options.scroll,
      scrollSpeed: options.scrollSpeed,
      scrollSensitivity: options.scrollSensitivity,
      delay:       options.delay,
      ghosting:    options.ghosting,
      constraint:  options.constraint,
      handle:      options.handle };

    if(options.starteffect)
      options_for_draggable.starteffect = options.starteffect;

    if(options.reverteffect)
      options_for_draggable.reverteffect = options.reverteffect;
    else
      if(options.ghosting) options_for_draggable.reverteffect = function(element) {
        element.style.top  = 0;
        element.style.left = 0;
      };

    if(options.endeffect)
      options_for_draggable.endeffect = options.endeffect;

    if(options.zindex)
      options_for_draggable.zindex = options.zindex;

    // build options for the droppables  
    var options_for_droppable = {
      overlap:     options.overlap,
      containment: options.containment,
      tree:        options.tree,
      hoverclass:  options.hoverclass,
      onHover:     Sortable.onHover
    }
    
    var options_for_tree = {
      onHover:      Sortable.onEmptyHover,
      overlap:      options.overlap,
      containment:  options.containment,
      hoverclass:   options.hoverclass
    }

    // fix for gecko engine
    Element.cleanWhitespace(element); 

    options.draggables = [];
    options.droppables = [];

    // drop on empty handling
    if(options.dropOnEmpty || options.tree) {
      Droppables.add(element, options_for_tree);
      options.droppables.push(element);
    }

    (options.elements || this.findElements(element, options) || []).each( function(e,i) {
      var handle = options.handles ? $(options.handles[i]) :
        (options.handle ? $(e).select('.' + options.handle)[0] : e); 
      options.draggables.push(
        new Draggable(e, Object.extend(options_for_draggable, { handle: handle })));
      Droppables.add(e, options_for_droppable);
      if(options.tree) e.treeNode = element;
      options.droppables.push(e);      
    });
    
    if(options.tree) {
      (Sortable.findTreeElements(element, options) || []).each( function(e) {
        Droppables.add(e, options_for_tree);
        e.treeNode = element;
        options.droppables.push(e);
      });
    }

    // keep reference
    this.sortables[element.id] = options;

    // for onupdate
    Draggables.addObserver(new SortableObserver(element, options.onUpdate));

  },

  // return all suitable-for-sortable elements in a guaranteed order
  findElements: function(element, options) {
    return Element.findChildren(
      element, options.only, options.tree ? true : false, options.tag);
  },
  
  findTreeElements: function(element, options) {
    return Element.findChildren(
      element, options.only, options.tree ? true : false, options.treeTag);
  },

  onHover: function(element, dropon, overlap) {
    if(Element.isParent(dropon, element)) return;

    if(overlap > .33 && overlap < .66 && Sortable.options(dropon).tree) {
      return;
    } else if(overlap>0.5) {
      Sortable.mark(dropon, 'before');
      if(dropon.previousSibling != element) {
        var oldParentNode = element.parentNode;
        element.style.visibility = "hidden"; // fix gecko rendering
        dropon.parentNode.insertBefore(element, dropon);
        if(dropon.parentNode!=oldParentNode) 
          Sortable.options(oldParentNode).onChange(element);
        Sortable.options(dropon.parentNode).onChange(element);
      }
    } else {
      Sortable.mark(dropon, 'after');
      var nextElement = dropon.nextSibling || null;
      if(nextElement != element) {
        var oldParentNode = element.parentNode;
        element.style.visibility = "hidden"; // fix gecko rendering
        dropon.parentNode.insertBefore(element, nextElement);
        if(dropon.parentNode!=oldParentNode) 
          Sortable.options(oldParentNode).onChange(element);
        Sortable.options(dropon.parentNode).onChange(element);
      }
    }
  },
  
  onEmptyHover: function(element, dropon, overlap) {
    var oldParentNode = element.parentNode;
    var droponOptions = Sortable.options(dropon);
        
    if(!Element.isParent(dropon, element)) {
      var index;
      
      var children = Sortable.findElements(dropon, {tag: droponOptions.tag, only: droponOptions.only});
      var child = null;
            
      if(children) {
        var offset = Element.offsetSize(dropon, droponOptions.overlap) * (1.0 - overlap);
        
        for (index = 0; index < children.length; index += 1) {
          if (offset - Element.offsetSize (children[index], droponOptions.overlap) >= 0) {
            offset -= Element.offsetSize (children[index], droponOptions.overlap);
          } else if (offset - (Element.offsetSize (children[index], droponOptions.overlap) / 2) >= 0) {
            child = index + 1 < children.length ? children[index + 1] : null;
            break;
          } else {
            child = children[index];
            break;
          }
        }
      }
      
      dropon.insertBefore(element, child);
      
      Sortable.options(oldParentNode).onChange(element);
      droponOptions.onChange(element);
    }
  },

  unmark: function() {
    if(Sortable._marker) Sortable._marker.hide();
  },

  mark: function(dropon, position) {
    // mark on ghosting only
    var sortable = Sortable.options(dropon.parentNode);
    if(sortable && !sortable.ghosting) return; 

    if(!Sortable._marker) {
      Sortable._marker = 
        ($('dropmarker') || Element.extend(document.createElement('DIV'))).
          hide().addClassName('dropmarker').setStyle({position:'absolute'});
      document.getElementsByTagName("body").item(0).appendChild(Sortable._marker);
    }    
    var offsets = Position.cumulativeOffset(dropon);
    Sortable._marker.setStyle({left: offsets[0]+'px', top: offsets[1] + 'px'});
    
    if(position=='after')
      if(sortable.overlap == 'horizontal') 
        Sortable._marker.setStyle({left: (offsets[0]+dropon.clientWidth) + 'px'});
      else
        Sortable._marker.setStyle({top: (offsets[1]+dropon.clientHeight) + 'px'});
    
    Sortable._marker.show();
  },
  
  _tree: function(element, options, parent) {
    var children = Sortable.findElements(element, options) || [];
  
    for (var i = 0; i < children.length; ++i) {
      var match = children[i].id.match(options.format);

      if (!match) continue;
      
      var child = {
        id: encodeURIComponent(match ? match[1] : null),
        element: element,
        parent: parent,
        children: [],
        position: parent.children.length,
        container: $(children[i]).down(options.treeTag)
      }
      
      /* Get the element containing the children and recurse over it */
      if (child.container)
        this._tree(child.container, options, child)
      
      parent.children.push (child);
    }

    return parent; 
  },

  tree: function(element) {
    element = $(element);
    var sortableOptions = this.options(element);
    var options = Object.extend({
      tag: sortableOptions.tag,
      treeTag: sortableOptions.treeTag,
      only: sortableOptions.only,
      name: element.id,
      format: sortableOptions.format
    }, arguments[1] || { });
    
    var root = {
      id: null,
      parent: null,
      children: [],
      container: element,
      position: 0
    }
    
    return Sortable._tree(element, options, root);
  },

  /* Construct a [i] index for a particular node */
  _constructIndex: function(node) {
    var index = '';
    do {
      if (node.id) index = '[' + node.position + ']' + index;
    } while ((node = node.parent) != null);
    return index;
  },

  sequence: function(element) {
    element = $(element);
    var options = Object.extend(this.options(element), arguments[1] || { });
    
    return $(this.findElements(element, options) || []).map( function(item) {
      return item.id.match(options.format) ? item.id.match(options.format)[1] : '';
    });
  },

  setSequence: function(element, new_sequence) {
    element = $(element);
    var options = Object.extend(this.options(element), arguments[2] || { });
    
    var nodeMap = { };
    this.findElements(element, options).each( function(n) {
        if (n.id.match(options.format))
            nodeMap[n.id.match(options.format)[1]] = [n, n.parentNode];
        n.parentNode.removeChild(n);
    });
   
    new_sequence.each(function(ident) {
      var n = nodeMap[ident];
      if (n) {
        n[1].appendChild(n[0]);
        delete nodeMap[ident];
      }
    });
  },
  
  serialize: function(element) {
    element = $(element);
    var options = Object.extend(Sortable.options(element), arguments[1] || { });
    var name = encodeURIComponent(
      (arguments[1] && arguments[1].name) ? arguments[1].name : element.id);
    
    if (options.tree) {
      return Sortable.tree(element, arguments[1]).children.map( function (item) {
        return [name + Sortable._constructIndex(item) + "[id]=" + 
                encodeURIComponent(item.id)].concat(item.children.map(arguments.callee));
      }).flatten().join('&');
    } else {
      return Sortable.sequence(element, arguments[1]).map( function(item) {
        return name + "[]=" + encodeURIComponent(item);
      }).join('&');
    }
  }
}

// Returns true if child is contained within element
Element.isParent = function(child, element) {
  if (!child.parentNode || child == element) return false;
  if (child.parentNode == element) return true;
  return Element.isParent(child.parentNode, element);
}

Element.findChildren = function(element, only, recursive, tagName) {   
  if(!element.hasChildNodes()) return null;
  tagName = tagName.toUpperCase();
  if(only) only = [only].flatten();
  var elements = [];
  $A(element.childNodes).each( function(e) {
    if(e.tagName && e.tagName.toUpperCase()==tagName &&
      (!only || (Element.classNames(e).detect(function(v) { return only.include(v) }))))
        elements.push(e);
    if(recursive) {
      var grandchildren = Element.findChildren(e, only, recursive, tagName);
      if(grandchildren) elements.push(grandchildren);
    }
  });

  return (elements.length>0 ? elements.flatten() : []);
}

Element.offsetSize = function (element, type) {
  return element['offset' + ((type=='vertical' || type=='height') ? 'Height' : 'Width')];
}

// script.aculo.us controls.js v1.8.1, Thu Jan 03 22:07:12 -0500 2008

// Copyright (c) 2005-2007 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
//           (c) 2005-2007 Ivan Krstic (http://blogs.law.harvard.edu/ivan)
//           (c) 2005-2007 Jon Tirsen (http://www.tirsen.com)
// Contributors:
//  Richard Livsey
//  Rahul Bhargava
//  Rob Wills
// 
// script.aculo.us is freely distributable under the terms of an MIT-style license.
// For details, see the script.aculo.us web site: http://script.aculo.us/

// Autocompleter.Base handles all the autocompletion functionality 
// that's independent of the data source for autocompletion. This
// includes drawing the autocompletion menu, observing keyboard
// and mouse events, and similar.
//
// Specific autocompleters need to provide, at the very least, 
// a getUpdatedChoices function that will be invoked every time
// the text inside the monitored textbox changes. This method 
// should get the text for which to provide autocompletion by
// invoking this.getToken(), NOT by directly accessing
// this.element.value. This is to allow incremental tokenized
// autocompletion. Specific auto-completion logic (AJAX, etc)
// belongs in getUpdatedChoices.
//
// Tokenized incremental autocompletion is enabled automatically
// when an autocompleter is instantiated with the 'tokens' option
// in the options parameter, e.g.:
// new Ajax.Autocompleter('id','upd', '/url/', { tokens: ',' });
// will incrementally autocomplete with a comma as the token.
// Additionally, ',' in the above example can be replaced with
// a token array, e.g. { tokens: [',', '\n'] } which
// enables autocompletion on multiple tokens. This is most 
// useful when one of the tokens is \n (a newline), as it 
// allows smart autocompletion after linebreaks.

if(typeof Effect == 'undefined')
  throw("controls.js requires including script.aculo.us' effects.js library");

var Autocompleter = { }
Autocompleter.Base = Class.create({
  baseInitialize: function(element, update, options) {
    element          = $(element)
    this.element     = element; 
    this.update      = $(update);  
    this.hasFocus    = false; 
    this.changed     = false; 
    this.active      = false; 
    this.index       = 0;     
    this.entryCount  = 0;
    this.oldElementValue = this.element.value;

    if(this.setOptions)
      this.setOptions(options);
    else
      this.options = options || { };

    this.options.paramName    = this.options.paramName || this.element.name;
    this.options.tokens       = this.options.tokens || [];
    this.options.frequency    = this.options.frequency || 0.4;
    this.options.minChars     = this.options.minChars || 1;
    this.options.onShow       = this.options.onShow || 
      function(element, update){ 
        if(!update.style.position || update.style.position=='absolute') {
          update.style.position = 'absolute';
          Position.clone(element, update, {
            setHeight: false, 
            offsetTop: element.offsetHeight
          });
        }
        Effect.Appear(update,{duration:0.15});
      };
    this.options.onHide = this.options.onHide || 
      function(element, update){ new Effect.Fade(update,{duration:0.15}) };

    if(typeof(this.options.tokens) == 'string') 
      this.options.tokens = new Array(this.options.tokens);
    // Force carriage returns as token delimiters anyway
    if (!this.options.tokens.include('\n'))
      this.options.tokens.push('\n');

    this.observer = null;
    
    this.element.setAttribute('autocomplete','off');

    Element.hide(this.update);

    Event.observe(this.element, 'blur', this.onBlur.bindAsEventListener(this));
    Event.observe(this.element, 'keydown', this.onKeyPress.bindAsEventListener(this));
  },

  show: function() {
    if(Element.getStyle(this.update, 'display')=='none') this.options.onShow(this.element, this.update);
    if(!this.iefix && 
      (Prototype.Browser.IE) &&
      (Element.getStyle(this.update, 'position')=='absolute')) {
      new Insertion.After(this.update, 
       '<iframe id="' + this.update.id + '_iefix" '+
       'style="display:none;position:absolute;filter:progid:DXImageTransform.Microsoft.Alpha(opacity=0);" ' +
       'src="javascript:false;" frameborder="0" scrolling="no"></iframe>');
      this.iefix = $(this.update.id+'_iefix');
    }
    if(this.iefix) setTimeout(this.fixIEOverlapping.bind(this), 50);
  },
  
  fixIEOverlapping: function() {
    Position.clone(this.update, this.iefix, {setTop:(!this.update.style.height)});
    this.iefix.style.zIndex = 1;
    this.update.style.zIndex = 2;
    Element.show(this.iefix);
  },

  hide: function() {
    this.stopIndicator();
    if(Element.getStyle(this.update, 'display')!='none') this.options.onHide(this.element, this.update);
    if(this.iefix) Element.hide(this.iefix);
  },

  startIndicator: function() {
    if(this.options.indicator) Element.show(this.options.indicator);
  },

  stopIndicator: function() {
    if(this.options.indicator) Element.hide(this.options.indicator);
  },

  onKeyPress: function(event) {
    if(this.active)
      switch(event.keyCode) {
       case Event.KEY_TAB:
       case Event.KEY_RETURN:
         this.selectEntry();
         Event.stop(event);
       case Event.KEY_ESC:
         this.hide();
         this.active = false;
         Event.stop(event);
         return;
       case Event.KEY_LEFT:
       case Event.KEY_RIGHT:
         return;
       case Event.KEY_UP:
         this.markPrevious();
         this.render();
         Event.stop(event);
         return;
       case Event.KEY_DOWN:
         this.markNext();
         this.render();
         Event.stop(event);
         return;
      }
     else 
       if(event.keyCode==Event.KEY_TAB || event.keyCode==Event.KEY_RETURN || 
         (Prototype.Browser.WebKit > 0 && event.keyCode == 0)) return;

    this.changed = true;
    this.hasFocus = true;

    if(this.observer) clearTimeout(this.observer);
      this.observer = 
        setTimeout(this.onObserverEvent.bind(this), this.options.frequency*1000);
  },

  activate: function() {
    this.changed = false;
    this.hasFocus = true;
    this.getUpdatedChoices();
  },

  onHover: function(event) {
    var element = Event.findElement(event, 'LI');
    if(this.index != element.autocompleteIndex) 
    {
        this.index = element.autocompleteIndex;
        this.render();
    }
    Event.stop(event);
  },
  
  onClick: function(event) {
    var element = Event.findElement(event, 'LI');
    this.index = element.autocompleteIndex;
    this.selectEntry();
    this.hide();
  },
  
  onBlur: function(event) {
    // needed to make click events working
    setTimeout(this.hide.bind(this), 250);
    this.hasFocus = false;
    this.active = false;     
  }, 
  
  render: function() {
    if(this.entryCount > 0) {
      for (var i = 0; i < this.entryCount; i++)
        this.index==i ? 
          Element.addClassName(this.getEntry(i),"selected") : 
          Element.removeClassName(this.getEntry(i),"selected");
      if(this.hasFocus) { 
        this.show();
        this.active = true;
      }
    } else {
      this.active = false;
      this.hide();
    }
  },
  
  markPrevious: function() {
    if(this.index > 0) this.index--
      else this.index = this.entryCount-1;
    this.getEntry(this.index).scrollIntoView(true);
  },
  
  markNext: function() {
    if(this.index < this.entryCount-1) this.index++
      else this.index = 0;
    this.getEntry(this.index).scrollIntoView(false);
  },
  
  getEntry: function(index) {
    return this.update.firstChild.childNodes[index];
  },
  
  getCurrentEntry: function() {
    return this.getEntry(this.index);
  },
  
  selectEntry: function() {
    this.active = false;
    this.updateElement(this.getCurrentEntry());
  },

  updateElement: function(selectedElement) {
    if (this.options.updateElement) {
      this.options.updateElement(selectedElement);
      return;
    }
    var value = '';
    if (this.options.select) {
      var nodes = $(selectedElement).select('.' + this.options.select) || [];
      if(nodes.length>0) value = Element.collectTextNodes(nodes[0], this.options.select);
    } else
      value = Element.collectTextNodesIgnoreClass(selectedElement, 'informal');
    
    var bounds = this.getTokenBounds();
    if (bounds[0] != -1) {
      var newValue = this.element.value.substr(0, bounds[0]);
      var whitespace = this.element.value.substr(bounds[0]).match(/^\s+/);
      if (whitespace)
        newValue += whitespace[0];
      this.element.value = newValue + value + this.element.value.substr(bounds[1]);
    } else {
      this.element.value = value;
    }
    this.oldElementValue = this.element.value;
    this.element.focus();
    
    if (this.options.afterUpdateElement)
      this.options.afterUpdateElement(this.element, selectedElement);
  },

  updateChoices: function(choices) {
    if(!this.changed && this.hasFocus) {
      this.update.innerHTML = choices;
      Element.cleanWhitespace(this.update);
      Element.cleanWhitespace(this.update.down());

      if(this.update.firstChild && this.update.down().childNodes) {
        this.entryCount = 
          this.update.down().childNodes.length;
        for (var i = 0; i < this.entryCount; i++) {
          var entry = this.getEntry(i);
          entry.autocompleteIndex = i;
          this.addObservers(entry);
        }
      } else { 
        this.entryCount = 0;
      }

      this.stopIndicator();
      this.index = 0;
      
      if(this.entryCount==1 && this.options.autoSelect) {
        this.selectEntry();
        this.hide();
      } else {
        this.render();
      }
    }
  },

  addObservers: function(element) {
    Event.observe(element, "mouseover", this.onHover.bindAsEventListener(this));
    Event.observe(element, "click", this.onClick.bindAsEventListener(this));
  },

  onObserverEvent: function() {
    this.changed = false;   
    this.tokenBounds = null;
    if(this.getToken().length>=this.options.minChars) {
      this.getUpdatedChoices();
    } else {
      this.active = false;
      this.hide();
    }
    this.oldElementValue = this.element.value;
  },

  getToken: function() {
    var bounds = this.getTokenBounds();
    return this.element.value.substring(bounds[0], bounds[1]).strip();
  },

  getTokenBounds: function() {
    if (null != this.tokenBounds) return this.tokenBounds;
    var value = this.element.value;
    if (value.strip().empty()) return [-1, 0];
    var diff = arguments.callee.getFirstDifferencePos(value, this.oldElementValue);
    var offset = (diff == this.oldElementValue.length ? 1 : 0);
    var prevTokenPos = -1, nextTokenPos = value.length;
    var tp;
    for (var index = 0, l = this.options.tokens.length; index < l; ++index) {
      tp = value.lastIndexOf(this.options.tokens[index], diff + offset - 1);
      if (tp > prevTokenPos) prevTokenPos = tp;
      tp = value.indexOf(this.options.tokens[index], diff + offset);
      if (-1 != tp && tp < nextTokenPos) nextTokenPos = tp;
    }
    return (this.tokenBounds = [prevTokenPos + 1, nextTokenPos]);
  }
});

Autocompleter.Base.prototype.getTokenBounds.getFirstDifferencePos = function(newS, oldS) {
  var boundary = Math.min(newS.length, oldS.length);
  for (var index = 0; index < boundary; ++index)
    if (newS[index] != oldS[index])
      return index;
  return boundary;
};

Ajax.Autocompleter = Class.create(Autocompleter.Base, {
  initialize: function(element, update, url, options) {
    this.baseInitialize(element, update, options);
    this.options.asynchronous  = true;
    this.options.onComplete    = this.onComplete.bind(this);
    this.options.defaultParams = this.options.parameters || null;
    this.url                   = url;
  },

  getUpdatedChoices: function() {
    this.startIndicator();
    
    var entry = encodeURIComponent(this.options.paramName) + '=' + 
      encodeURIComponent(this.getToken());

    this.options.parameters = this.options.callback ?
      this.options.callback(this.element, entry) : entry;

    if(this.options.defaultParams) 
      this.options.parameters += '&' + this.options.defaultParams;
    
    new Ajax.Request(this.url, this.options);
  },

  onComplete: function(request) {
    this.updateChoices(request.responseText);
  }
});

// The local array autocompleter. Used when you'd prefer to
// inject an array of autocompletion options into the page, rather
// than sending out Ajax queries, which can be quite slow sometimes.
//
// The constructor takes four parameters. The first two are, as usual,
// the id of the monitored textbox, and id of the autocompletion menu.
// The third is the array you want to autocomplete from, and the fourth
// is the options block.
//
// Extra local autocompletion options:
// - choices - How many autocompletion choices to offer
//
// - partialSearch - If false, the autocompleter will match entered
//                    text only at the beginning of strings in the 
//                    autocomplete array. Defaults to true, which will
//                    match text at the beginning of any *word* in the
//                    strings in the autocomplete array. If you want to
//                    search anywhere in the string, additionally set
//                    the option fullSearch to true (default: off).
//
// - fullSsearch - Search anywhere in autocomplete array strings.
//
// - partialChars - How many characters to enter before triggering
//                   a partial match (unlike minChars, which defines
//                   how many characters are required to do any match
//                   at all). Defaults to 2.
//
// - ignoreCase - Whether to ignore case when autocompleting.
//                 Defaults to true.
//
// It's possible to pass in a custom function as the 'selector' 
// option, if you prefer to write your own autocompletion logic.
// In that case, the other options above will not apply unless
// you support them.

Autocompleter.Local = Class.create(Autocompleter.Base, {
  initialize: function(element, update, array, options) {
    this.baseInitialize(element, update, options);
    this.options.array = array;
  },

  getUpdatedChoices: function() {
    this.updateChoices(this.options.selector(this));
  },

  setOptions: function(options) {
    this.options = Object.extend({
      choices: 10,
      partialSearch: true,
      partialChars: 2,
      ignoreCase: true,
      fullSearch: false,
      selector: function(instance) {
        var ret       = []; // Beginning matches
        var partial   = []; // Inside matches
        var entry     = instance.getToken();
        var count     = 0;

        for (var i = 0; i < instance.options.array.length &&  
          ret.length < instance.options.choices ; i++) { 

          var elem = instance.options.array[i];
          var foundPos = instance.options.ignoreCase ? 
            elem.toLowerCase().indexOf(entry.toLowerCase()) : 
            elem.indexOf(entry);

          while (foundPos != -1) {
            if (foundPos == 0 && elem.length != entry.length) { 
              ret.push("<li><strong>" + elem.substr(0, entry.length) + "</strong>" + 
                elem.substr(entry.length) + "</li>");
              break;
            } else if (entry.length >= instance.options.partialChars && 
              instance.options.partialSearch && foundPos != -1) {
              if (instance.options.fullSearch || /\s/.test(elem.substr(foundPos-1,1))) {
                partial.push("<li>" + elem.substr(0, foundPos) + "<strong>" +
                  elem.substr(foundPos, entry.length) + "</strong>" + elem.substr(
                  foundPos + entry.length) + "</li>");
                break;
              }
            }

            foundPos = instance.options.ignoreCase ? 
              elem.toLowerCase().indexOf(entry.toLowerCase(), foundPos + 1) : 
              elem.indexOf(entry, foundPos + 1);

          }
        }
        if (partial.length)
          ret = ret.concat(partial.slice(0, instance.options.choices - ret.length))
        return "<ul>" + ret.join('') + "</ul>";
      }
    }, options || { });
  }
});

// AJAX in-place editor and collection editor
// Full rewrite by Christophe Porteneuve <tdd@tddsworld.com> (April 2007).

// Use this if you notice weird scrolling problems on some browsers,
// the DOM might be a bit confused when this gets called so do this
// waits 1 ms (with setTimeout) until it does the activation
Field.scrollFreeActivate = function(field) {
  setTimeout(function() {
    Field.activate(field);
  }, 1);
}

Ajax.InPlaceEditor = Class.create({
  initialize: function(element, url, options) {
    this.url = url;
    this.element = element = $(element);
    this.prepareOptions();
    this._controls = { };
    arguments.callee.dealWithDeprecatedOptions(options); // DEPRECATION LAYER!!!
    Object.extend(this.options, options || { });
    if (!this.options.formId && this.element.id) {
      this.options.formId = this.element.id + '-inplaceeditor';
      if ($(this.options.formId))
        this.options.formId = '';
    }
    if (this.options.externalControl)
      this.options.externalControl = $(this.options.externalControl);
    if (!this.options.externalControl)
      this.options.externalControlOnly = false;
    this._originalBackground = this.element.getStyle('background-color') || 'transparent';
    this.element.title = this.options.clickToEditText;
    this._boundCancelHandler = this.handleFormCancellation.bind(this);
    this._boundComplete = (this.options.onComplete || Prototype.emptyFunction).bind(this);
    this._boundFailureHandler = this.handleAJAXFailure.bind(this);
    this._boundSubmitHandler = this.handleFormSubmission.bind(this);
    this._boundWrapperHandler = this.wrapUp.bind(this);
    this.registerListeners();
  },
  checkForEscapeOrReturn: function(e) {
    if (!this._editing || e.ctrlKey || e.altKey || e.shiftKey) return;
    if (Event.KEY_ESC == e.keyCode)
      this.handleFormCancellation(e);
    else if (Event.KEY_RETURN == e.keyCode)
      this.handleFormSubmission(e);
  },
  createControl: function(mode, handler, extraClasses) {
    var control = this.options[mode + 'Control'];
    var text = this.options[mode + 'Text'];
    if ('button' == control) {
      var btn = document.createElement('input');
      btn.type = 'submit';
      btn.value = text;
      btn.className = 'editor_' + mode + '_button';
      if ('cancel' == mode)
        btn.onclick = this._boundCancelHandler;
      this._form.appendChild(btn);
      this._controls[mode] = btn;
    } else if ('link' == control) {
      var link = document.createElement('a');
      link.href = '#';
      link.appendChild(document.createTextNode(text));
      link.onclick = 'cancel' == mode ? this._boundCancelHandler : this._boundSubmitHandler;
      link.className = 'editor_' + mode + '_link';
      if (extraClasses)
        link.className += ' ' + extraClasses;
      this._form.appendChild(link);
      this._controls[mode] = link;
    }
  },
  createEditField: function() {
    var text = (this.options.loadTextURL ? this.options.loadingText : this.getText());
    var fld;
    if (1 >= this.options.rows && !/\r|\n/.test(this.getText())) {
      fld = document.createElement('input');
      fld.type = 'text';
      var size = this.options.size || this.options.cols || 0;
      if (0 < size) fld.size = size;
    } else {
      fld = document.createElement('textarea');
      fld.rows = (1 >= this.options.rows ? this.options.autoRows : this.options.rows);
      fld.cols = this.options.cols || 40;
    }
    fld.name = this.options.paramName;
    fld.value = text; // No HTML breaks conversion anymore
    fld.className = 'editor_field';
    if (this.options.submitOnBlur)
      fld.onblur = this._boundSubmitHandler;
    this._controls.editor = fld;
    if (this.options.loadTextURL)
      this.loadExternalText();
    this._form.appendChild(this._controls.editor);
  },
  createForm: function() {
    var ipe = this;
    function addText(mode, condition) {
      var text = ipe.options['text' + mode + 'Controls'];
      if (!text || condition === false) return;
      ipe._form.appendChild(document.createTextNode(text));
    };
    this._form = $(document.createElement('form'));
    this._form.id = this.options.formId;
    this._form.addClassName(this.options.formClassName);
    this._form.onsubmit = this._boundSubmitHandler;
    this.createEditField();
    if ('textarea' == this._controls.editor.tagName.toLowerCase())
      this._form.appendChild(document.createElement('br'));
    if (this.options.onFormCustomization)
      this.options.onFormCustomization(this, this._form);
    addText('Before', this.options.okControl || this.options.cancelControl);
    this.createControl('ok', this._boundSubmitHandler);
    addText('Between', this.options.okControl && this.options.cancelControl);
    this.createControl('cancel', this._boundCancelHandler, 'editor_cancel');
    addText('After', this.options.okControl || this.options.cancelControl);
  },
  destroy: function() {
    if (this._oldInnerHTML)
      this.element.innerHTML = this._oldInnerHTML;
    this.leaveEditMode();
    this.unregisterListeners();
  },
  enterEditMode: function(e) {
    if (this._saving || this._editing) return;
    this._editing = true;
    this.triggerCallback('onEnterEditMode');
    if (this.options.externalControl)
      this.options.externalControl.hide();
    this.element.hide();
    this.createForm();
    this.element.parentNode.insertBefore(this._form, this.element);
    if (!this.options.loadTextURL)
      this.postProcessEditField();
    if (e) Event.stop(e);
  },
  enterHover: function(e) {
    if (this.options.hoverClassName)
      this.element.addClassName(this.options.hoverClassName);
    if (this._saving) return;
    this.triggerCallback('onEnterHover');
  },
  getText: function() {
    return this.element.innerHTML;
  },
  handleAJAXFailure: function(transport) {
    this.triggerCallback('onFailure', transport);
    if (this._oldInnerHTML) {
      this.element.innerHTML = this._oldInnerHTML;
      this._oldInnerHTML = null;
    }
  },
  handleFormCancellation: function(e) {
    this.wrapUp();
    if (e) Event.stop(e);
  },
  handleFormSubmission: function(e) {
    var form = this._form;
    var value = $F(this._controls.editor);
    this.prepareSubmission();
    var params = this.options.callback(form, value) || '';
    if (Object.isString(params))
      params = params.toQueryParams();
    params.editorId = this.element.id;
    if (this.options.htmlResponse) {
      var options = Object.extend({ evalScripts: true }, this.options.ajaxOptions);
      Object.extend(options, {
        parameters: params,
        onComplete: this._boundWrapperHandler,
        onFailure: this._boundFailureHandler
      });
      new Ajax.Updater({ success: this.element }, this.url, options);
    } else {
      var options = Object.extend({ method: 'get' }, this.options.ajaxOptions);
      Object.extend(options, {
        parameters: params,
        onComplete: this._boundWrapperHandler,
        onFailure: this._boundFailureHandler
      });
      new Ajax.Request(this.url, options);
    }
    if (e) Event.stop(e);
  },
  leaveEditMode: function() {
    this.element.removeClassName(this.options.savingClassName);
    this.removeForm();
    this.leaveHover();
    this.element.style.backgroundColor = this._originalBackground;
    this.element.show();
    if (this.options.externalControl)
      this.options.externalControl.show();
    this._saving = false;
    this._editing = false;
    this._oldInnerHTML = null;
    this.triggerCallback('onLeaveEditMode');
  },
  leaveHover: function(e) {
    if (this.options.hoverClassName)
      this.element.removeClassName(this.options.hoverClassName);
    if (this._saving) return;
    this.triggerCallback('onLeaveHover');
  },
  loadExternalText: function() {
    this._form.addClassName(this.options.loadingClassName);
    this._controls.editor.disabled = true;
    var options = Object.extend({ method: 'get' }, this.options.ajaxOptions);
    Object.extend(options, {
      parameters: 'editorId=' + encodeURIComponent(this.element.id),
      onComplete: Prototype.emptyFunction,
      onSuccess: function(transport) {
        this._form.removeClassName(this.options.loadingClassName);
        var text = transport.responseText;
        if (this.options.stripLoadedTextTags)
          text = text.stripTags();
        this._controls.editor.value = text;
        this._controls.editor.disabled = false;
        this.postProcessEditField();
      }.bind(this),
      onFailure: this._boundFailureHandler
    });
    new Ajax.Request(this.options.loadTextURL, options);
  },
  postProcessEditField: function() {
    var fpc = this.options.fieldPostCreation;
    if (fpc)
      $(this._controls.editor)['focus' == fpc ? 'focus' : 'activate']();
  },
  prepareOptions: function() {
    this.options = Object.clone(Ajax.InPlaceEditor.DefaultOptions);
    Object.extend(this.options, Ajax.InPlaceEditor.DefaultCallbacks);
    [this._extraDefaultOptions].flatten().compact().each(function(defs) {
      Object.extend(this.options, defs);
    }.bind(this));
  },
  prepareSubmission: function() {
    this._saving = true;
    this.removeForm();
    this.leaveHover();
    this.showSaving();
  },
  registerListeners: function() {
    this._listeners = { };
    var listener;
    $H(Ajax.InPlaceEditor.Listeners).each(function(pair) {
      listener = this[pair.value].bind(this);
      this._listeners[pair.key] = listener;
      if (!this.options.externalControlOnly)
        this.element.observe(pair.key, listener);
      if (this.options.externalControl)
        this.options.externalControl.observe(pair.key, listener);
    }.bind(this));
  },
  removeForm: function() {
    if (!this._form) return;
    this._form.remove();
    this._form = null;
    this._controls = { };
  },
  showSaving: function() {
    this._oldInnerHTML = this.element.innerHTML;
    this.element.innerHTML = this.options.savingText;
    this.element.addClassName(this.options.savingClassName);
    this.element.style.backgroundColor = this._originalBackground;
    this.element.show();
  },
  triggerCallback: function(cbName, arg) {
    if ('function' == typeof this.options[cbName]) {
      this.options[cbName](this, arg);
    }
  },
  unregisterListeners: function() {
    $H(this._listeners).each(function(pair) {
      if (!this.options.externalControlOnly)
        this.element.stopObserving(pair.key, pair.value);
      if (this.options.externalControl)
        this.options.externalControl.stopObserving(pair.key, pair.value);
    }.bind(this));
  },
  wrapUp: function(transport) {
    this.leaveEditMode();
    // Can't use triggerCallback due to backward compatibility: requires
    // binding + direct element
    this._boundComplete(transport, this.element);
  }
});

Object.extend(Ajax.InPlaceEditor.prototype, {
  dispose: Ajax.InPlaceEditor.prototype.destroy
});

Ajax.InPlaceCollectionEditor = Class.create(Ajax.InPlaceEditor, {
  initialize: function($super, element, url, options) {
    this._extraDefaultOptions = Ajax.InPlaceCollectionEditor.DefaultOptions;
    $super(element, url, options);
  },

  createEditField: function() {
    var list = document.createElement('select');
    list.name = this.options.paramName;
    list.size = 1;
    this._controls.editor = list;
    this._collection = this.options.collection || [];
    if (this.options.loadCollectionURL)
      this.loadCollection();
    else
      this.checkForExternalText();
    this._form.appendChild(this._controls.editor);
  },

  loadCollection: function() {
    this._form.addClassName(this.options.loadingClassName);
    this.showLoadingText(this.options.loadingCollectionText);
    var options = Object.extend({ method: 'get' }, this.options.ajaxOptions);
    Object.extend(options, {
      parameters: 'editorId=' + encodeURIComponent(this.element.id),
      onComplete: Prototype.emptyFunction,
      onSuccess: function(transport) {
        var js = transport.responseText.strip();
        if (!/^\[.*\]$/.test(js)) // TODO: improve sanity check
          throw 'Server returned an invalid collection representation.';
        this._collection = eval(js);
        this.checkForExternalText();
      }.bind(this),
      onFailure: this.onFailure
    });
    new Ajax.Request(this.options.loadCollectionURL, options);
  },

  showLoadingText: function(text) {
    this._controls.editor.disabled = true;
    var tempOption = this._controls.editor.firstChild;
    if (!tempOption) {
      tempOption = document.createElement('option');
      tempOption.value = '';
      this._controls.editor.appendChild(tempOption);
      tempOption.selected = true;
    }
    tempOption.update((text || '').stripScripts().stripTags());
  },

  checkForExternalText: function() {
    this._text = this.getText();
    if (this.options.loadTextURL)
      this.loadExternalText();
    else
      this.buildOptionList();
  },

  loadExternalText: function() {
    this.showLoadingText(this.options.loadingText);
    var options = Object.extend({ method: 'get' }, this.options.ajaxOptions);
    Object.extend(options, {
      parameters: 'editorId=' + encodeURIComponent(this.element.id),
      onComplete: Prototype.emptyFunction,
      onSuccess: function(transport) {
        this._text = transport.responseText.strip();
        this.buildOptionList();
      }.bind(this),
      onFailure: this.onFailure
    });
    new Ajax.Request(this.options.loadTextURL, options);
  },

  buildOptionList: function() {
    this._form.removeClassName(this.options.loadingClassName);
    this._collection = this._collection.map(function(entry) {
      return 2 === entry.length ? entry : [entry, entry].flatten();
    });
    var marker = ('value' in this.options) ? this.options.value : this._text;
    var textFound = this._collection.any(function(entry) {
      return entry[0] == marker;
    }.bind(this));
    this._controls.editor.update('');
    var option;
    this._collection.each(function(entry, index) {
      option = document.createElement('option');
      option.value = entry[0];
      option.selected = textFound ? entry[0] == marker : 0 == index;
      option.appendChild(document.createTextNode(entry[1]));
      this._controls.editor.appendChild(option);
    }.bind(this));
    this._controls.editor.disabled = false;
    Field.scrollFreeActivate(this._controls.editor);
  }
});

//**** DEPRECATION LAYER FOR InPlace[Collection]Editor! ****
//**** This only  exists for a while,  in order to  let ****
//**** users adapt to  the new API.  Read up on the new ****
//**** API and convert your code to it ASAP!            ****

Ajax.InPlaceEditor.prototype.initialize.dealWithDeprecatedOptions = function(options) {
  if (!options) return;
  function fallback(name, expr) {
    if (name in options || expr === undefined) return;
    options[name] = expr;
  };
  fallback('cancelControl', (options.cancelLink ? 'link' : (options.cancelButton ? 'button' :
    options.cancelLink == options.cancelButton == false ? false : undefined)));
  fallback('okControl', (options.okLink ? 'link' : (options.okButton ? 'button' :
    options.okLink == options.okButton == false ? false : undefined)));
  fallback('highlightColor', options.highlightcolor);
  fallback('highlightEndColor', options.highlightendcolor);
};

Object.extend(Ajax.InPlaceEditor, {
  DefaultOptions: {
    ajaxOptions: { },
    autoRows: 3,                                // Use when multi-line w/ rows == 1
    cancelControl: 'link',                      // 'link'|'button'|false
    cancelText: 'cancel',
    clickToEditText: 'Click to edit',
    externalControl: null,                      // id|elt
    externalControlOnly: false,
    fieldPostCreation: 'activate',              // 'activate'|'focus'|false
    formClassName: 'inplaceeditor-form',
    formId: null,                               // id|elt
    highlightColor: '#ffff99',
    highlightEndColor: '#ffffff',
    hoverClassName: '',
    htmlResponse: true,
    loadingClassName: 'inplaceeditor-loading',
    loadingText: 'Loading...',
    okControl: 'button',                        // 'link'|'button'|false
    okText: 'ok',
    paramName: 'value',
    rows: 1,                                    // If 1 and multi-line, uses autoRows
    savingClassName: 'inplaceeditor-saving',
    savingText: 'Saving...',
    size: 0,
    stripLoadedTextTags: false,
    submitOnBlur: false,
    textAfterControls: '',
    textBeforeControls: '',
    textBetweenControls: ''
  },
  DefaultCallbacks: {
    callback: function(form) {
      return Form.serialize(form);
    },
    onComplete: function(transport, element) {
      // For backward compatibility, this one is bound to the IPE, and passes
      // the element directly.  It was too often customized, so we don't break it.
      new Effect.Highlight(element, {
        startcolor: this.options.highlightColor, keepBackgroundImage: true });
    },
    onEnterEditMode: null,
    onEnterHover: function(ipe) {
      ipe.element.style.backgroundColor = ipe.options.highlightColor;
      if (ipe._effect)
        ipe._effect.cancel();
    },
    onFailure: function(transport, ipe) {
      alert('Error communication with the server: ' + transport.responseText.stripTags());
    },
    onFormCustomization: null, // Takes the IPE and its generated form, after editor, before controls.
    onLeaveEditMode: null,
    onLeaveHover: function(ipe) {
      ipe._effect = new Effect.Highlight(ipe.element, {
        startcolor: ipe.options.highlightColor, endcolor: ipe.options.highlightEndColor,
        restorecolor: ipe._originalBackground, keepBackgroundImage: true
      });
    }
  },
  Listeners: {
    click: 'enterEditMode',
    keydown: 'checkForEscapeOrReturn',
    mouseover: 'enterHover',
    mouseout: 'leaveHover'
  }
});

Ajax.InPlaceCollectionEditor.DefaultOptions = {
  loadingCollectionText: 'Loading options...'
};

// Delayed observer, like Form.Element.Observer, 
// but waits for delay after last key input
// Ideal for live-search fields

Form.Element.DelayedObserver = Class.create({
  initialize: function(element, delay, callback) {
    this.delay     = delay || 0.5;
    this.element   = $(element);
    this.callback  = callback;
    this.timer     = null;
    this.lastValue = $F(this.element); 
    Event.observe(this.element,'keyup',this.delayedListener.bindAsEventListener(this));
  },
  delayedListener: function(event) {
    if(this.lastValue == $F(this.element)) return;
    if(this.timer) clearTimeout(this.timer);
    this.timer = setTimeout(this.onTimerEvent.bind(this), this.delay * 1000);
    this.lastValue = $F(this.element);
  },
  onTimerEvent: function() {
    this.timer = null;
    this.callback(this.element, $F(this.element));
  }
});

/*
 * InPlaceEditor extension that adds a 'click to edit' text when the field is 
 * empty.
 */
Ajax.InPlaceEditorWithEmptyText = Class.create (Ajax.InPlaceEditor,
{
	initialize:
		function ($super, element, url, options)
		{
			if (!options.emptyText)        options.emptyText      = 'Kliknij aby zmienić…';
			if (!options.emptyClassName)   options.emptyClassName = 'inplaceeditor-empty';

			$super(element, url, options);

			this.checkEmpty();
		},

	checkEmpty:
		function()
		{
			if (this.element.innerHTML.length == 0 && this.options.emptyText)
				this.element.appendChild (new Element ('span', { className : this.options.emptyClassName }).update (this.options.emptyText))
		},

	getText:
		function ($super)
		{
			if (empty_span = this.element.select('.' + this.options.emptyClassName).first())
				empty_span.remove();
			return $super()
		},

	leaveEditMode:
		function ($super, transport)
		{
			this.checkEmpty()
			return $super(transport)
		}
})


Ajax.InPlaceEditor.xDefaultOptions = {
	okText: 'Zapisz',
	cancelText: 'Anuluj',
	savingText: 'Trwa zapisywanie…',
	clickToEditText: 'Kliknij by zmienić',
	highlightcolor: '#FFF588',
	onComplete: function (transport, element) {
		if (transport)
		{
			if (transport.status != 200)
			{
				if (transport.status == 403)
					alert ('Jesteś niezalogowany')
				else
					alert (transport.responseText)
				element.update (this.saved_value)
				this.enterEditMode ('click')
			}
			else
				new Effect.Highlight (element, { startcolor: this.options.highlightcolor })
		}
	},
	onEnterEditMode: function (editor) {
		editor.saved_value = editor.element.innerHTML
	},
	callback: function (form, value) {
		return $H({ authenticity_token: window.authenticity_token, value: value }).toQueryString()
	}
}


var InPlaceCheckboxUpdater = Class.create ({
	initialize:
		function (element, url, options)
		{
			this.element = $(element)
			this.url = url
			this.options = {
				checked: false,
				editorId: this.element.id,
				additional_parameters: {}
			}
			this.ajax_options = {
				method: 'post'
			}
			this.force_ajax_options = {
				onSuccess: this.success.bind (this),
				onFailure: this.failure.bind (this)
			}
			Object.extend (this.options, options)
			Object.extend (this.ajax_options, options.ajaxOptions)
			Object.extend (this.ajax_options, this.force_ajax_options)

			this.element.addClassName ('in-place-checkbox-updater')
			this.label = new Element ('label')
			this.label.update (this.element.innerHTML)
			this.element.update (this.label)
			this.checkbox = new Element ('input', { type: 'checkbox' })
			this.checkbox.observe ('click', this.clicked.bind (this))
			this.checkbox.checked = options.checked
			this.label.insertBefore (this.checkbox, this.label.firstChild)
		},

	clicked:
		function (event)
		{
			this.checkbox.disable()
			this.element.addClassName ('disabled')
			new Ajax.Request (this.url, Object.extend ({ parameters: Object.extend ({ editorId: this.options.editorId, value: this.checkbox.checked }, this.options.additional_parameters) }, this.ajax_options))
		},

	success:
		function (transport)
		{
			this.checkbox.enable()
			this.element.removeClassName ('disabled')
		},

	failure:
		function (transport)
		{
			alert (transport.responseText)
			this.checkbox.checked = !this.checkbox.checked
			this.checkbox.enable()
			this.element.removeClassName ('disabled')
		}
})


/**
 * Element extensions
 */
Element.addMethods ({
	switchClassNames:
		function (element, bool, on_class, off_class)
		{
			if (bool)
			{
				element.removeClassName (off_class)
				if (on_class)
					element.addClassName (on_class)
			}
			else
			{
				element.removeClassName (on_class)
				if (off_class)
					element.addClassName (off_class)
			}
			return element
		},

	visibility_show:
		function (element)
		{
			return element.setStyle ({ visibility: '', position: '', height: '', width: '', overflow: '' })
		},

	visibility_hide:
		function (element)
		{
			return element.setStyle ({ visibility: 'hidden', position: 'absolute', overflow: 'hidden', width: '1px', height: '1px' })
		}
})


/*
 * Raphael 0.6.4 - JavaScript Vector Library
 *
 * Copyright (c) 2008 – 2009 Dmitry Baranovskiy (http://raphaeljs.com)
 * Licensed under the MIT (http://www.opensource.org/licenses/mit-license.php) license.
 */
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m=1i.1D("1B:2N"),3c=m.1q;3c.17=l.17+"1I";3c.1b=l.1b+"1I";m.1f="";K(i["56"]){m.6g=i["56"]}m.3o=9.3o;m.3l=9.3l;g.1j(m);l.1l.1j(g);J p=1M A(m,g,l);p.18=1X;p.1p="1f";p.1f=[];p.13={x:0,y:0,1Q:0,1S:0,18:1X};p.2B="";p.3i=N(){9.18=1X;11 9};p.3Z=N(){9.18=2T;11 9};p.3j=N(x,y){J d=9.18?"m":"t";d+=15.1d(19(x,10))+" "+15.1d(19(y,10));9.1c.1f=9.2B+=d;9.13.x=(9.18?0:9.13.x)+19(x,10);9.13.y=(9.18?0:9.13.y)+19(y,10);9.13.18=9.18;9.O.1f+=(9.18?"M":"m")+[x,y];11 9};p.26=N(x,y){J d=9.18?"l":"r";d+=15.1d(19(x,10))+" "+15.1d(19(y,10));9[0].1f=9.2B+=d;9.13.x=(9.18?0:9.13.x)+19(x,10);9.13.y=(9.18?0:9.13.y)+19(y,10);9.13.18=9.18;9.O.1f+=(9.18?"L":"l")+[x,y];11 9};p.46=N(a,b,c,e,f,g){f=(9.18?0:9.13.x)+f;g=(9.18?0:9.13.y)+g;J 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g};',62,460,'|||||||||this||||||||||||||||||||||||||||||||||||var|if|||function|attrs|arguments||||||||||||return||last|length|Math||width|isAbsolute|parseFloat|setAttribute|height|node|round|case|path|stroke|break|document|appendChild|else|canvas|for|_|ii|type|style|Raphael|attr|prototype|fill|typeof|parentNode|opacity|Group|join|parseInt|rvml|top|createElement|cy|cx|blue|green|px|curveTo|dots|in|new|number|undefined|toString|bx|diff|by|000|substring|vml|toFixed|true|left|now||font|jj|svgns|none|createElementNS|lineTo|switch|group||text|svg|cs|diry|ry|rx|100|firstChild|rect|push|position|vector|rt|split|absolute|image|splice|removeChild|transformations|hue|start|on|insertBefore|color|rollback|string|scale|Path|sx|translation|gradient|apply|os|to|sy|translate|default|setBox|dasharray|shape|id|dy|dim|object|toLowerCase|false|toUpperCase|getAttribute|rotation|that|tx|ty|parsePathString|min|ellipse|circle|rs|els|qx|gs|call|gl|Array|deg|ol|SVG|qy|255|url|butt|absolutely|moveTo|filterMatrix|coordorigin|getElementsByTagName|childNodes|coordsize|y1|offset|pathToAbsolute|bs|remove|getBBox|pathToRelative|VML|linecap|pattern|size|defs|pathfinder|stop|pathDimensions|command|max|animation_in_progress|charAt|qcurveTo|hsb2rgb|display|body|rotate|xlink|safari|availableAnimAttrs|colour|csv|data|nextSibling|callee|filterOpacity|set|prev|name|relatively|src|hex|clearTimeout|skip|columnWidth|rowHeight|arcTo|transform|replace|getRGB|rgb|miterlimit|abs|linejoin|dashes|addDashes|M0|textpath|gradients|andClose|family|clear|saturation|square|_create|miny|filter|weight|processPath|match|edgeCases|namespaces|div|toBack|instanceof|insertAfter|2px|ig|version|block|getColor|hsb|toFront|miter|brightness|Microsoft|DXImageTransform|progid|show|fff|hide|Arial|oval|getElementById|throw|Error|container|not|raphael|found|window|getTime|Date|5522|pathEqualiser|addRoundedCorner|continue||class||setTimeout|org|w3|www|http|while|200|320|offsetHeight|offsetWidth|cplineTo|9999em|href|svgattr|setAttributeNS|createTextNode|behavior|userSpaceOnUse|strokeWidth|linear|gradientTitle|addRule|img|patternTransform|onload|method|patternUnits|ar|at|wr|wa|color2|sqrt|dashstyle|createStyleSheet|colors|value|com|preserveAspectRatio|anchor|middle|qb|opacity2|longdashdotdot|longdashdot|create|dashdot|longdash|y2|qcurve|2000|1999|drawGrid|microsoft|atan|navigator|vendor|Apple|Computer|Inc|arg|angle|Matrix|M11|M12|M21|M22|270|Dx|radial|className|slice|Dy|sizingmethod|auto|expand|filtertype|bilinear|focus|pos|animate|focusposition|x2|x1|RotX|dash|RotY|Scale|schemas|urn|add|tile|shift|dot|shortdashdotdot|shortdashdot|SVGAngle|Gradient|CanvasRenderingContext2D|Canvas|only|Your|shortdot|shortdash|browser|null|doesn|support|nYou|are|running|unescape|Rapha|textpathok|EBl|ps|arcsize|roundrect|stroked|16px|floor||rgb2hsb|filled|flat|endcap|Alpha|fontFamily|fontSize|075|reset|joinstyle|fontWeight|achlmqstvz|relative|solid|clip|concat|tagName|200px|320px|item'.split('|'),0,{}))

/*
 * version: 0.1
 *
 * License: GPL 2.0 or newer.
 */

var ValidatorFunctions =
{
	set_validator_error_message:
		function (msg) {
			this.__v_error_message = msg
		},

	add_validator:
		function (o) {
			if (!this.__v_validators)
				this.__v_validators = []
			this.__v_validators.push (o)
		},

	validate:
		function() {
			var error = false
			var msgs = []
			for (var i = 0; i < this.__v_validators.length; ++i)
			{
				o = this.__v_validators[i]
				el = this
				if (o.name)
					el = this.elements[o.name]
				if (!o.predicate (el))
				{
					error = true
					msgs.push (o.message)
				}
			}
			if (error)
			{
				var msg = '<div class="validator-messages">\n'
						+ '<p>' + this.__v_error_message + '</p>\n'
						+ '<ul><li>' + msgs.join (',</li><li>') + '</li></ul>\n'
						+ '</div>\n'
				this.__v_onerrors (msg)
			}
			return !error;
		},

	set_message_event:
		function (onerrors) {
			this.__v_onerrors = onerrors;
		}
};

var Validator = {
	extend_element:
		function (elem) {
			for (var i in ValidatorFunctions)
				elem[i] = ValidatorFunctions[i]
			elem.onsubmit = function() {
				return this.validate()
			}
		},

	min_length:
		function (x) {
			return function (elem) {
				return elem.value.length >= x
			}
		},

	max_length:
		function (x) {
			return function (elem) {
				return elem.value.length <= x
			}
		}
};


// Namespace for use in external attributes and nodes
// (struct xmlns is defined in mcv-prototype):
var xmlns = {
	infopedia: 'http://infopedia.pl'
}


/**
 * Show exceptions from Ajax responders.
 */
Ajax.Responders.register ({
	onException: function (requester, exception) {
		console && console.info (requester, exception)
	}
})


function Module (callback)
{
	return callback()
}


var Infopedia = {
	base_href: null,

	set_admin_mode:
		function()
		{
			this.admin_mode = true
		},

	// Call functions from list:
	on_unload:
		function()
		{
			if (this.on_unload_functions)
				this.on_unload_functions.each (function (value) { value() })
		},

	// Registers unload function:
	register_on_unload:
		function (f)
		{
			if (!this.on_unload_functions)
				this.on_unload_functions = []
			this.on_unload_functions.push (f)
		},

	// For every button (in form) with x-confirm='text' attribute
	// hooks confirm dialog on 'onclick' to confirm submission
	// of the form. x-confirm attribute value will be shown in
	// confirm dialog.
	add_click_confirmations:
		function()
		{
			$$('*').reject (function (el) {
				return !el.getAttributeNS || !el.getAttribute ('x-confirm')
			}).each (function (el) {
				el.onclick = function (event) {
					return confirm (this.getAttribute ('x-confirm'))
				}
			})
		},

	add_togglers:
		function()
		{
			$$('*').each (function (element) {
				var m = /toggler-of\(([^\)]+)\)/.exec (element.className)
				if (m)
				{
					var target = $(m[1])
					if (!target)
						alert ("Element with id='" + m[1] + "' not found.")
					else if (!target.toggler_initialized)
					{
						target.hide()
						element.toggleClassName ('closed')
						element.onclick = function() {
							if (target.visible())
								target.blindUp ({ duration: 0.25 })
							else
								target.blindDown ({ duration: 0.25 })
							element.toggleClassName ('closed')
							element.toggleClassName ('opened')
						}
						target.toggler_initialized = true
					}
				}
			})
		},

	// Setups city-selector and district-selector.
	// districts_json is a map: (place-id => [[district-id, district-name], …])
	setup_city_and_district_selectors:
		function (params)
		{
			city_sel = $(params.city_sel)
			district_sel = $(params.district_sel)
			var districts_map = params.json.evalJSON()
			var update_districts = function() {
				var city = city_sel
				var districts = district_sel
				var j = params.add_everywhere? 1 : 0
				districts.options.length = districts_map[city.value].length + j
				if (params.add_everywhere)
				{
					districts.options[0].value = ''
					districts.options[0].text = Translations.Everywhere
				}
				for (var i = 0; i < districts.options.length - j; ++i)
				{
					districts.options[i+j].value = districts_map[city.value][i][0]
					districts.options[i+j].text = districts_map[city.value][i][1]
					if (districts.options[i+j].value == params.district_id)
						districts.options[i+j].selected = true
				}
			}
			city_sel.observe ('change', update_districts)
			// If global 'domain' variable is set:
			if (Infopedia.domain && Infopedia.domain.subdomain && params.auto_select_city)
			{
				var s = $A(city_sel.options).find (function (option) { return option.value == Infopedia.domain.city_id })
				if (s)
					s.selected = true
			}
			update_districts()
		},

	setup_legends:
		function()
		{
			$$('.reservation-legend').each (function (elem) {
				elem.select ('.inner').each (function (r) { r.hide() })
				elem.observe ('mouseover', function() {
					elem.select ('.inner').each (function (r) {
						if (r.in_effect)
							r.in_effect.cancel()
						r.in_effect = new Effect.Appear (r, { duration: 0.25, afterFinish: function() { r.in_effect = null } })
					})
				})
				elem.observe ('mouseout', function() {
					elem.select ('.inner').each (function (r) {
						if (r.in_effect)
							r.in_effect.cancel()
						r.in_effect = new Effect.Fade (r, { duration: 0.25, afterFinish: function() { r.in_effect = null } })
					})
				})
			})
		},

	autohide_flashes:
		function()
		{
			return
			$$('.flash').each (function (elem) {
				new Effect.Parallel ([
					new Effect.Fade (elem, { sync: true }),
					new Effect.BlindUp (elem, { sync: true })
				], {
					duration: 1.0,
					delay: 5.0
				})
			})
		},

	// When javascript enabled, shows all elements with class js-show
	// otherwise not visible. Additionally hides (display: none) all
	// elements with class js-hide otherwise shown.
	update_show_hide_elements:
		function()
		{
			// Unhide elements that use JS:
			$$('.js-show').each (function (value) { value.removeClassName ('js-show') })
			// Hide elements that should be hidden when JS works:
			$$('.js-hide').each (function (value) { value.hide() })
		},

	update_elements:
		function()
		{
			if (!this.admin_mode)
			{
				// Buttons
				$$('.button').each (function (element) {
					if (!element.dom_updated) {
						element.style.background = 'none'
						var x = element
						x = Element.wrap (x, { 'class': 'button-wrapper top-left' })
						x = Element.wrap (x, { 'class': 'button-wrapper top-right' })
						x = Element.wrap (x, { 'class': 'button-wrapper bottom-left' })
						x = Element.wrap (x, { 'class': 'button-wrapper bottom-right' })
						x = Element.wrap (x, { 'class': 'button-wrapper outer' })
						element.dom_updated = true
					}
				})
				// .panel-header
				$$('.panel-header').each (function (element) {
					if (!element.already_wrapped)
					{
						element.wrap ('div', { 'class': 'panel-header-wrapper' })
						// Add rounded corders if class is 'rounded'
						if (element.hasClassName ('rounded'))
						{
							element.appendChild (new Element ('div', { 'class': 'header-round-t-l' }))
							element.appendChild (new Element ('div', { 'class': 'header-round-t-r' }))
						}
						else if (element.hasClassName ('rounded-left'))
							element.appendChild (new Element ('div', { 'class': 'header-round-t-l' }))
						else if (element.hasClassName ('rounded-right'))
							element.appendChild (new Element ('div', { 'class': 'header-round-t-r' }))
						// Updated:
						element.already_wrapped = true
					}
				})
				// .panel-content
				$$('.panel-content').each (function (element) {
					if (!element.already_wrapped)
					{
						element.wrap ('div', { 'class': 'panel-content-wrapper' })
						// Updated:
						element.already_wrapped = true
					}
				})
				// .rounded-block
				$$('.rounded-block').each (function (element) {
					['header-round-t-l', 'header-round-t-r', 'header-round-b-l', 'header-round-b-r'].each (function (class_name) {
						element.appendChild (new Element ('div', { 'class': class_name }))
					})
				})
			}
		},

	update_tabbed_elements:
		function()
		{
			$$('.tabbed').each (function (value) {
				if (!value.tabbed_enhanced)
					new Infopedia.Tabbed (value)
			})
		},

	dom_updated:
		function()
		{
			this.add_click_confirmations()
			this.add_togglers()
			this.update_show_hide_elements()
			this.update_elements()
			this.update_tabbed_elements()
		},

	first_visit_monit:
		function()
		{
			this.first_visit_message = $('first-visit-message')

			if (this.first_visit_message)
			{
				this.first_visit_message.close = function() {
					Infopedia.set_cookie ('first-visited', '1', 86400 * 365 * 10, '/', '.' + Infopedia.domain.main)
					new Effect.Parallel ([
						new Effect.BlindUp (this, { sync: true }),
						new Effect.Fade (this, { sync: true })
					], { duration: 0.5 })
				}

				this.first_visit_message.open = function() {
					Effect.BlindDown (this, { duration: 0.5 })
					Effect.Appear (this, { duration: 0.5 })
				}

				this.first_visit_message.select ('.close').invoke ('observe', 'click', this.first_visit_message.close.bind (this.first_visit_message))

				if (!Infopedia.get_cookie ('first-visited'))
					setTimeout (this.first_visit_message.open.bind (this.first_visit_message), 1000)
			}
		},

	search_in_monit:
		function()
		{
			this.search_in_baloon = $('search-in-baloon')

			if (this.search_in_baloon)
			{
				this.search_in_baloon.close = function() {
					Infopedia.set_cookie ('search-in-closed', '1', 86400 * 365 * 10, '/', '.' + Infopedia.domain.main)
					Effect.Fade (this, { duration: 0.25 })
				}

				this.search_in_baloon.open = function() {
					Effect.Appear (this, { duration: 0.25 })
				}

				this.search_in_baloon.select ('.close').invoke ('observe', 'click', this.search_in_baloon.close.bind (this.search_in_baloon))

				if (!Infopedia.get_cookie ('search-in-closed'))
					setTimeout (this.search_in_baloon.open.bind (this.search_in_baloon), 1000)
			}
		},

	add_onload:
		function (callback)
		{
			if (!this.onloads)
				this.onloads = [callback]
			else
				this.onloads.push (callback)
		},

	fire_onloads:
		function()
		{
			this.onloads.each (function (onload) { onload() })
		},

	get_cookie:
		function (name)
		{
			var start = document.cookie.indexOf (name + "=")
			var len = start + name.length + 1
			if ((!start) && (name != document.cookie.substring (0, name.length)))
				return null
			if (start == -1)
				return null
			var end = document.cookie.indexOf (';', len)
			if (end == -1)
				end = document.cookie.length
			return unescape (document.cookie.substring (len, end))
		},

	set_cookie:
		function (name, value, expires, path, domain, secure)
		{
			var expires_date = new Date()
			expires_date.setTime (expires_date.getTime() + expires * 1000)
			document.cookie = name + '=' + escape (value) +
				(expires? ';expires=' + expires_date.toGMTString() : '') + //expires.toGMTString()
				(path? ';path=' + path : '') +
				(domain? ';domain=' + domain : '') +
				(secure? ';secure' : '')
		},

	del_cookie:
		function (name, path, domain)
		{
			if (getCookie (name))
				document.cookie = name + '=' +
					(path? ';path=' + path : '') +
					(domain? ';domain=' + domain : '') +
					';expires=Thu, 01-Jan-1970 00:00:01 GMT';
		},

	auto_clear_input:
		function (element)
		{
			element = $(element)
			element.observe ('focus', function() { if (this.value == this.defaultValue) this.value = '' })
			element.observe ('blur', function() { if (!this.value) this.value = this.defaultValue })
			element.observe ('keyup', function (event) { if (event.keyCode == 27) this.value = '' })
		},

	xhr_failure:
		function (transport)
		{
			alert ('Komunikat serwera: #{response}'.interpolate ({ response: transport.responseText.stripHTML() }))
		},

	DOM: {
		appendChildrenOf:
			function (target, source)
			{
				for (var i = 0, N = source.childNodes.length; i < N; ++i)
				{
					try {
						target.appendChild (source.childNodes[i].cloneNode (true))
					}
					catch (e)
					{ }
				}
				return element
			},

		removeChildren:
			function (element)
			{
				while (element.firstChild)
					element.removeChild (element.firstChild)
				return element
			},

		moveChildren:
			function (source, destination)
			{
				while (source.firstChild)
					destination.appendChild (source.removeChild (source.firstChild))
			}
	}
}

Infopedia.add_onload (function() {
	Infopedia.dom_updated()
	Infopedia.first_visit_monit()
	Infopedia.setup_legends()
	Infopedia.autohide_flashes()
	// Language selector.
	var ls = $('language-selector')
	if (ls)
	{
		ls.select ('form')[0].observe ('change', function (event) {
			this.form.submit()
		})
	}
	Infopedia.base_href = $$('base')[0].getAttribute ('href').rtrim('/')
})

Event.observe (window, 'unload', Infopedia.on_unload.bind (Infopedia))

function getCookie (c_name)
{
	if (document.cookie.length>0)
	{
		c_start=document.cookie.indexOf(c_name + "=");
		if (c_start!=-1)
		{ 
			c_start=c_start + c_name.length+1; 
			c_end=document.cookie.indexOf(";",c_start);
			if (c_end==-1) c_end=document.cookie.length;
			return unescape(document.cookie.substring(c_start,c_end));
		} 
	}
	return "";
}


function h (s)
{
	return s.toString().replace (/&/g, "&amp;").replace (/</g, "&lt;").replace (/>/g, "&gt;")
}


var OneToManyManager = Class.create ({
	/**
	 * Options:
	 *  sortable: a Sortable object for sorting list.
	 *  after_insert: lambda that is called after insertion of new element with arguments (item),
	 *  	where item is a <li> that has been created.
	 *  after_remove: lambda that is called after deletion of element.
	 */
	initialize:
		function (select, list, adder, options)
		{
			this.options = Object.extend ({
				sortable: null,
				after_insert: null
			}, options)

			this.select = $(select)
			this.list = $(list)
			this.adder = $(adder)

			this.__bind_events()
			this.__update()
		},

	destroy:
		function()
		{
			this.adder.stopObserving ('click', this.adder_observer)
		},

	__bind_events:
		function()
		{
			this.adder_observer = this.__adder_click.bind (this)
			this.adder.observe ('click', this.adder_observer)
		},

	__update:
		function()
		{
			this.select.disabled = (this.select.length == 0)
			if (this.adder instanceof HTMLButtonElement)
				this.adder.disabled = (this.select.length == 0)
		},

	__adder_click:
		function()
		{
		}
})


/*
 * Requires: Prototype (http://www.prototypejs.org)
 */

Object.extend (String.prototype,
{
trim:
	function (chars)
	{
		return this.ltrim (chars).rtrim (chars)
	},

ltrim:
	function (chars)
	{
		var i = this.find_first_not_of (chars)
		if (i == -1)
			return ''
		return this.substr (i)
	},

rtrim:
	function (chars)
	{
		return this.substr (0, this.find_last_not_of (chars) + 1)
	},

find_first_not_of:
	function (chars)
	{
		var not_of
		for (var i = 0; i < this.length; ++i)
		{
			not_of = true
			for (var j = 0; j < chars.length; ++j)
				if (this[i] == chars[j])
				{
					not_of = false
					break
				}
			if (not_of)
				return i
		}
		return -1
	},

find_last_not_of:
	function (chars)
	{
		// Starting from the end, find first character that
		// is not one of listed in @chars:
		var not_of
		for (var i = this.length; i >= 0; --i)
		{
			not_of = true
			for (var j = 0; j < chars.length; ++j)
			{
				// MSIE sh*t doesn't know about string[0] notation:
				if (this.substr (i, 1) == chars[j])
				{
					not_of = false
					break
				}
			}
			if (not_of)
				return i
		}
		return -1
	},

stripHTML:
	function()
	{
		var reTag = /<(?:.|\s)*?>/g
		return this.replace (reTag, "")
	}
})


if (!Infopedia)
	Infopedia = {}

Infopedia.Tabbed = Class.create ({
	initialize:
		function (element)
		{
			this.element = $(element)
			this.element.tabbed_enhanced = this
			var t = this.element.select ('.tabbed-tab')
			// Get only direct descendants:
			this.tabs = []
			for (var i = 0; i < t.length; ++i)
				if (t[i].parentNode == this.element)
					this.tabs.push (t[i])
			this.target = this.element.down ('.tabbed-target')
			if (!this.target)
			{
				this.target = new Element ('div', { 'class': 'tabbed-target' })
				this.element.appendChild (this.target)
			}
			this.selected_source = null
			var tab_to_select = 0
			for (var i = 0; i < this.tabs.length; ++i)
			{
				if (this.tabs[i].default_selected)
					tab_to_select = i

				this.tabs[i].heading = this.tabs[i].down ('.tabbed-heading')
				this.tabs[i].heading.addClassName ('js-on')
				this.tabs[i].heading.observe ('click', this.select_tab_closure (this.tabs[i]))
				this.tabs[i].heading.tabber_select = this.select_tab_closure (this.tabs[i])

				this.tabs[i].content = this.tabs[i].down ('.tabbed-content')
				if (!this.tabs[i].content)
					alert ("No .tabbed-content for tab #{name}".interpolate ({ name: this.tabs.heading.innerHTML }))
				this.tabs[i].removeChild (this.tabs[i].content)
				this.target.appendChild (this.tabs[i].content)
				this.tabs[i].content.visibility_hide()
			}
			this.select_tab (this.tabs[tab_to_select])
		},

	select_tab:
		function (tab)
		{
			for (var i = 0, j = this.tabs.length; i < j; ++i)
			{
				this.tabs[i].content.visibility_hide()
				this.tabs[i].heading.removeClassName ('selected')
				this.tabs[i].on_tab_unselect && this.tabs[i].on_tab_unselect()
			}
			tab.content.visibility_show()
			tab.heading.addClassName ('selected')
			tab.on_tab_select && tab.on_tab_select()
		},

	select_tab_closure:
		function (tab)
		{
			return (function (event) {
				this.select_tab (tab)
			}).bind (this)
		}
})


/**
 * Blackbox - free implementation of powerful Lightview.
 * (C) 2009 Michał „mcv” Gawron
 * Licensed under GNU Lesser General Public License
 *
 * Dependencies:
 *  • PrototypeJS.org.
 */


/**
 * Blackbox base class
 */


var Blackbox = Class.create ({
	initialize:
		function (options)
		{
			this.options = {
				container: document.body,
				animation_duration: 0.2,
				dim_background: null
			}
			Object.extend (this.options, options)
			this.options.container = $(this.options.container)

			if (!document.body)
				throw new String ("can't use Blackbox on document.body before all DOM is loaded")

			this.elements = {}
			if (this.options.container != document.body)
				this.options.container.relativize()
			this.elements.dim = new Element ('div', {
				'class': 'blackbox blackbox-dim',
				style: 'display: none; position: ' + ((this.options.container == document.body)? 'fixed' : 'absolute')
			})
			this.elements.dim.observe ('click', this.close.bind (this))
			this.elements.box = new Element ('div', { 'class': 'blackbox-box', style: 'display: none' })
			if (this.options.dim_background)
				this.elements.dim.style.background = this.options.dim_background
			this.elements.box.observe ('click', function (event) { event.stopPropagation() })
			this.elements.loading = new Element ('div', { 'class': 'blackbox-loading', style: 'display: none' })
			this.elements.dim.appendChild (this.elements.box)
			this.elements.box.appendChild (this.elements.loading)
			this.options.container.appendChild (this.elements.dim)
			this.__resize_to (120, 120, { instantly: true })
			this.current_animation = null
		},

	// Deprecated
	load:
		function (loader)
		{
			loader.load && loader.load()
		},

	open:
		function (options)
		{
			options = Object.extend ({
				show_loading: false
			}, options)
			// Install new window resize listener:
			this.saved_window_onresize = window.onresize
			window.onresize = this.__document_resized.bind (this)
			// Open Blackbox:
			if (this.elements.box.visible())
				options.afterFinish && options.afterFinish()
			else
			{
				this.current_animation && this.current_animation.cancel()
				this.current_animation = Effect.Appear (this.elements.dim, {
					duration: this.options.animation_duration,
					afterFinish: function() {
						this.current_animation = Effect.Appear (this.elements.box, {
							duration: this.options.animation_duration,
							afterFinish: options.afterFinish
						})
					}.bind (this)
				})
			}
			if (this.keydown_observer)
				document.stopObserving ('keydown', this.keydown_observer)
			this.keydown_observer = function (event) {
				this.loader && this.loader.keydown (event)
			}.bind (this)
			document.observe ('keydown', this.keydown_observer)
		},

	close:
		function (options)
		{
			if (!this.elements.dim.visible())
				return
			document.stopObserving ('keydown', this.keydown_observer)
			options = options || {}
			// Close Blackbox:
			this.current_animation && this.current_animation.cancel()
			this.current_animation = Effect.Fade (this.elements.box, {
				duration: this.options.animation_duration * 0.25,
				afterFinish: function() {
					this.current_animation = Effect.Fade (this.elements.dim, {
						duration: this.options.animation_duration * 0.5,
						afterFinish: options.afterFinish
					})
				}.bind (this)
			})
			// Reinstall old window resize listener:
			window.onresize = this.saved_window_onresize
		},

	put:
		function (element, options)
		{
			options = options || {}
			this.elements.element = new Element ('div', { 'class': 'blackbox-inner-box' })
			this.elements.element.update (element)
			element = this.elements.element
			element.blackbox = this
			// Put element into Blackbox:
			element.hide()
			this.elements.box.appendChild (element)
			this.__resize_to (element.getWidth(), element.getHeight(), {
				afterFinish: function() {
					this.current_animation = Effect.Appear (element, {
						duration: this.options.animation_duration,
						afterFinish: options.afterFinish
					})
				}.bind (this)
			})
		},

	clear:
		function (options)
		{
			options = options || {}
			if (this.elements.element)
			{
				this.current_animation && this.current_animation.cancel()
				this.current_animation = Effect.Fade (this.elements.element, {
					duration: this.options.animation_duration * 0.5,
					afterFinish: function() {
						this.elements.element.parentNode.removeChild (this.elements.element)
						this.elements.element = null
						options.afterFinish && options.afterFinish()
					}.bind (this)
				})
			}
			else
				options.afterFinish && options.afterFinish()
		},

	show_loading:
		function (show, options)
		{
			options = options || {}
			// 22 is height/width of loading image:
			var left = (this.elements.box.getWidth() - 22) / 2
			var top = (this.elements.box.getHeight() - 22) / 2
			this.elements.loading.setStyle ({ left: left + 'px', top: top + 'px' })
			this.current_animation && this.current_animation.cancel()
			if (show)
				this.current_animation = Effect.Appear (this.elements.loading, {
					duration: 0.2,
					afterFinish: options.afterFinish
				})
			else
				this.current_animation = Effect.Fade (this.elements.loading, {
					duration: 0.2,
					afterFinish: options.afterFinish
				})
		},

	container:
		function()
		{
			return this.elements.element
		},

	__compute_position:
		function (width, height)
		{
			var padding = 12
			var left = (this.elements.dim.getWidth() - (width + 2 * padding)) / 2
			var top = (this.elements.dim.getHeight() - (height + 2 * padding)) / 2
			return { top: top, left: left, width: width, height: height }
		},

	__resize_to:
		function (width, height, options)
		{
			options = options || {}
			options.instantly = options.instantly || false
			options.afterFinish = options.afterFinish || null
			var pos = this.__compute_position (this.options.forced_width || width, this.options.forced_height || height)
			var style = { top: pos.top + 'px', left: pos.left + 'px', width: pos.width + 'px', height: pos.height + 'px' }
			if (options.instantly)
			{
				this.elements.box.setStyle (style)
				options.afterFinish && options.afterFinish()
			}
			else
			{
				this.current_animation && this.current_animation.cancel()
				this.current_animation = new Effect.Morph (this.elements.box, {
					style: style,
					duration: this.options.animation_duration,
					afterFinish: options.afterFinish
				})
			}
		},

	__document_resized:
		function()
		{
			this.__resize_to (this.elements.element.getWidth(), this.elements.element.getHeight())
		}
})


Blackbox.alloc = function (options) {
	return new Blackbox (options)
}


Blackbox.find_nearest = function (element) {
	element = $(element)
	while (element !== null)
	{
		if (element.blackbox)
			return element.blackbox
		else
			element = element.parentNode
	}
	return null
}


Blackbox.Loader = Class.create ({
	initialize:
		function (blackbox)
		{
			this.blackbox = blackbox
		},

	load:
		function()
		{
			this.blackbox.loader = this
		},

	keydown:
		function (event)
		{
			if (event.keyCode == 27) // Escape
				this.blackbox.close()
		}
})


// Loaders namespace:
Blackbox.Loaders = Class.create()


// Blackbox singleton created on document.body:
document.observe ('dom:loaded', function() {
	Blackbox.Singleton = new Blackbox()
})


/**
 * Various Blackbox loaders
 */


// Image loader:
Blackbox.Loaders.Image = Class.create (Blackbox.Loader, {
	initialize:
		function ($super, blackbox, image_url, options)
		{
			$super (blackbox)
			this.image_url = image_url
			this.options = {}
			this.options = Object.extend ({
				max_width: 0.95,
				max_height: 0.95
			}, options)
		},

	load:
		function ($super)
		{
			$super()
			var blackbox = this.blackbox
			var wrapper = new Element ('div', { 'class': 'blackbox-image' })
			var image = new Image()
			var foot = new Element ('div', { 'class': 'blackbox-generic-foot' })
			var foot_left = new Element ('div', { 'class': 'blackbox-generic-foot-left' })
			var foot_right = new Element ('div', { 'class': 'blackbox-generic-foot-right' })
			var caption = new Element ('p', { 'class': 'blackbox-generic-caption' }).update (this.options.caption)
			var prever = new Element ('div', { 'class': 'blackbox-generic-prev-button' }).update ('Prev')
			var nexter = new Element ('div', { 'class': 'blackbox-generic-next-button' }).update ('Next')
			if (this.options.prev_callback)
				prever.observe ('click', this.options.prev_callback)
			else
				prever.addClassName ('disabled')
			if (this.options.next_callback)
				nexter.observe ('click', this.options.next_callback)
			else
				nexter.addClassName ('disabled')
			foot_right.appendChild (prever)
			foot_right.appendChild (nexter)
			if (!this.options.prev_callback && !this.options.next_callback)
			{
				nexter.style.visibility = 'hidden'
				prever.style.visibility = 'hidden'
			}
			var closer = new Element ('div', { 'class': 'blackbox-generic-close-button' }).update ('Close')
			closer.observe ('click', blackbox.close.bind (blackbox))
			foot_left.appendChild (caption)
			foot_right.appendChild (closer)
			foot.appendChild (foot_left)
			foot.appendChild (foot_right)
			wrapper.appendChild (image)
			wrapper.appendChild (foot)
			if (this.options.max_height)
			{
				var h = blackbox.elements.dim.getHeight()
				image.setStyle ('max-height: #{max}px'.interpolate ({ max: this.options.max_height * h - 55 }))
			}
			if (this.options.max_width)
			{
				var h = blackbox.elements.dim.getWidth()
				image.setStyle ('max-width: #{max}px'.interpolate ({ max: this.options.max_width * h - 24 }))
			}
			image.observe ('load', function() {
				blackbox.show_loading (false, {
					afterFinish: function() {
						blackbox.put (wrapper)
					}.bind (this)
				})
			}.bind (this))
			image.observe ('error', function() {
				blackbox.show_loading (false, {
					afterFinish: function() {
						blackbox.put (new Element ('p', { 'class': 'error' }).update ('Unable to load image <code>#{image_url}</code>'.interpolate ({ image_url: this.image_url })))
					}.bind (this)
				})
			}.bind (this))
			blackbox.clear ({
				afterFinish: function() {
					blackbox.open ({
						afterFinish: function() {
							blackbox.show_loading (true, {
								afterFinish: function() {
									image.src = this.image_url
								}.bind (this)
							})
						}.bind (this)
					})
				}.bind (this)
			})
		},

	keydown:
		function ($super, event)
		{
			$super (event)
			if (this.options.gallery)
			{
				if (event.keyCode == 37) // Arrow left
					this.options.gallery.prev()
				else if (event.keyCode == 39 || event.keyCode == 32) // Arrow right or space
					this.options.gallery.next()
			}
		}
})


// Image gallery helper:
Blackbox.Loaders.Image.Gallery = Class.create (Blackbox.Loader, {
	initialize:
		function ($super, blackbox, images)
		{
			$super (blackbox)
			this.images = images
			this.current_index = null
		},

	load_url:
		function (url)
		{
			// Find image with given url:
			var image_params = this.images.find (function (params) { return params[0] == url })
			if (image_params)
			{
				this.current_index = this.images.indexOf (image_params)
				if (this.current_index > 0)
					image_params[1].prev_callback = this.prev.bind (this)
				if (this.current_index < this.images.length - 1)
					image_params[1].next_callback = this.next.bind (this)
				this.blackbox.load_image (image_params[0], Object.extend (image_params[1], { gallery: this }))
			}
		},

	prev:
		function()
		{
			if (this.current_index > 0)
				this.load_url (this.images[this.current_index-1][0])
		},

	next:
		function()
		{
			if (this.current_index < this.images.length - 1)
				this.load_url (this.images[this.current_index+1][0])
		}
})


// Register Blackbox#load_image shortcut:
Blackbox.prototype.load_image = function (image_url, options) { (new Blackbox.Loaders.Image (this, image_url, options)).load() }


// Page loader:
Blackbox.Loaders.Page = Class.create (Blackbox.Loader, {
	initialize:
		function ($super, blackbox, page_url, options)
		{
			$super (blackbox)
			this.page_url = page_url
			this.options = {}
			Object.extend (this.options, options)
		},

	load:
		function ($super)
		{
			$super()
			var blackbox = this.blackbox
			var wrapper = new Element ('div', { 'class': 'blackbox-page' })
			var page = new Element ('iframe', { src: this.page_url, width: blackbox.elements.dim.getWidth() - 24 - 50, height: blackbox.elements.dim.getHeight() - 24 - 75 })
			var foot = new Element ('div', { 'class': 'blackbox-generic-foot' })
			var foot_left = new Element ('div', { 'class': 'blackbox-generic-foot-left' })
			var foot_right = new Element ('div', { 'class': 'blackbox-generic-foot-right' })
			var caption = new Element ('p', { 'class': 'blackbox-generic-caption' }).update (this.options.caption)
			var closer = new Element ('div', { 'class': 'blackbox-generic-close-button' }).update ('Close')
			closer.observe ('click', blackbox.close.bind (blackbox))
			foot_left.appendChild (caption)
			foot_right.appendChild (closer)
			foot.appendChild (foot_left)
			foot.appendChild (foot_right)
			wrapper.appendChild (page)
			wrapper.appendChild (foot)
			blackbox.clear ({
				afterFinish: function() {
					blackbox.open ({
						afterFinish: function() {
							blackbox.put (wrapper)
						}.bind (this)
					})
				}.bind (this)
			})
		}
})


// Register Blackbox#load_page shortcut:
Blackbox.prototype.load_page = function (page_url, options) { (new Blackbox.Loaders.Page (this, page_url, options)).load() }


// DOM loader:
Blackbox.Loaders.DOM = Class.create (Blackbox.Loader, {
	initialize:
		function ($super, blackbox, dom_or_text, options)
		{
			$super (blackbox)
			this.dom_or_text = dom_or_text
			this.options = {}
			Object.extend (this.options, options)
		},

	load:
		function ($super)
		{
			$super()
			this.blackbox.clear ({
				afterFinish: function() {
					this.blackbox.open ({
						afterFinish: function() {
							this.wrapper = new Element ('div', { 'class': 'blackbox-dom' })
							this.wrapper.update (this.dom_or_text)
							this.options.afterLoad && this.options.afterLoad (this.wrapper)
							this.blackbox.put (this.wrapper)
						}.bind (this)
					})
				}.bind (this)
			})
		}
})


// Register Blackbox#load_dom shortcut:
Blackbox.prototype.load_dom = function (dom_or_text, options) { (new Blackbox.Loaders.DOM (this, dom_or_text, options)).load() }


// XHR loader:
Blackbox.Loaders.XHR = Class.create (Blackbox.Loader, {
	initialize:
		function ($super, blackbox, url, request_params, options)
		{
			$super (blackbox)
			this.url = url
			this.request_params = request_params
			this.options = {}
			Object.extend (this.options, options)
		},

	container:
		function()
		{
			return this.wrapper
		},

	load:
		function ($super)
		{
			$super()
			this.blackbox.clear ({
				afterFinish: function() {
					this.blackbox.open ({
						afterFinish: function() {
							this.blackbox.show_loading (true, {
								afterFinish: function() {
									this.wrapper = new Element ('div', { 'class': 'blackbox-dom' })
									new Ajax.Request (this.url, Object.extend (this.request_params, {
										onSuccess: this.__success.bind (this),
										onFailure: this.__failure.bind (this)
									}))
								}.bind (this)
							})
						}.bind (this)
					})
				}.bind (this)
			})
		},

	__success:
		function (transport)
		{
			this.blackbox.show_loading (false, {
				afterFinish: function() {
					this.wrapper.update (transport.responseText)
					this.options.afterLoad && this.options.afterLoad (this.wrapper)
					this.blackbox.put (this.wrapper)
				}.bind (this)
			})
		},

	__failure:
		function (transport)
		{
			this.blackbox.show_loading (false, {
				afterFinish: function() {
					this.wrapper.update (transport.responseText)
					this.blackbox.put (this.wrapper)
				}.bind (this)
			})
		}
})


// Register Blackbox#load_xhr shortcut:
Blackbox.prototype.load_xhr = function (url, request_params, options) { (new Blackbox.Loaders.XHR (this, url, request_params, options)).load() }
Blackbox.prototype.post_form = function (form, request_params, options) { (new Blackbox.Loaders.XHR (this, form.action, Object.extend ({ method: form.method, parameters: form.serialize() }, request_params), options)).load() }


var Starset = Class.create ({
initialize:
	function (element, star_number)
	{
		this.element = $(element)
		this.element.addClassName ('starset')
		this.stars = []
		var starset = this
		for (var i = 0; i < star_number; i += 1)
		{
			var star = new Element ('span')
			star.addClassName ('star')
			star.index = i + 1
			star.observe ('mouseover', function() {
				if (!starset.readonly)
					starset.hover (this.index)
			})
			star.observe ('mouseout', function() {
				if (!starset.readonly)
					starset.hover (0)
			})
			star.observe ('click', function() {
				if (!starset.readonly)
				{
					starset.observers.before_click.each (function (o) { o (this.index) }.bind (this))
					starset.latch (this.index)
					starset.observers.after_click.each (function (o) { o (this.index) }.bind (this))
				}
			})
			this.element.appendChild (star)
			this.stars.push (star)
		}
		this.hovered = 0
		this.latched = 0
		this.readonly = false
		this.observers = { before_click: [], after_click: [], before_latch: [], after_latch: [], before_unlatch: [], after_unlatch: [] }
		this.update()
	},

observe:
	function (event_type, callback)
	{
		if (!(event_type instanceof Array))
			event_type = [event_type]
		event_type.each (function (v) { this.observers[v].push (callback) }.bind (this))
	},

set_readonly:
	function (set)
	{
		this.readonly = set
	},

hover:
	function (stars)
	{
		this.hovered = stars
		this.update()
	},

latch:
	function (stars)
	{
		this.observers.before_latch.each (function (o) { o (stars) })
		this.latched = stars
		this.update()
		this.observers.after_latch.each (function (o) { o() })
	},

unlatch:
	function()
	{
		this.observers.before_unlatch.each (function (o) { o() })
		this.latched = 0
		this.update()
		this.observers.after_unlatch.each (function (o) { o() })
	},

// Private
update:
	function()
	{
		var i = 0
		var k = (this.hovered > 0)? this.hovered : this.latched
		this.stars.each (function (star) {
			star.removeClassName ((i < k)? 'lo' : 'hi')
			star.addClassName ((i < k)? 'hi' : 'lo')
			i += 1
		}.bind (this))
	}
})

/**
 * Handlers before_move, after_move get array of moved items as an argument,
 * others get one argument: item.
 */
var Surface = Class.create ({
	/**
	 * options:
	 *   multiselect: true/false - if false when selecting item other will be deselected unless Ctrl key is pressed;
	 *   bg_unselect: true/false - if true, clicks on background will deselect all items;
	 *   selections: true/false - whether to enable 'box' selections;
	 *   allow_moving: true/false - whether to enable moving of objects.
	 */
	initialize:
		function (element, options)
		{
			this.element = $(element)
			this.element.relativize()
			this.element.wrap (new Element ('div', { 'class': 'surface-wrapper' }))
			this.enabled = false
			var e = this.element.getDimensions()

			// Process options:
			options || (options = {})
			options.selections || (options.selections = {})

			this.options = {
				allow_moving:	false,
				selections:		{ multiselect: false, box: false, click: false, bg_unselect: false },
				grid:			{ x: 1, y: 1 },
				center:			{ x: e.width / 2, y: e.height / 2 },
				tag_saver:		false
			}
			Object.extend (this.options, options)

			this.options.selections = {
				multiselect:	false,
				box:			false,
				click:			false,
				bg_unselect:	false
			}
			Object.extend (this.options.selections, options.selections)

			if (this.options.allow_moving)
				this.element.addClassName ('allow_moving')
			if (this.options.allow_clicks)
				this.element.addClassName ('allow_clicks')

			// Ary of items:
			this.items = []
			// Items being moved:
			this.moved_items = []
			this.anchored_at = null
			// Selection:
			this.selection = null
			// TagSaver:
			this.tag_saver = new Surface.TagSaver (this)
			// Aligner:
			this.aligner = new Surface.Aligner (this)
			// Create vector canvas:
			this.canvas = new Raphael (this.element, e.width, e.height);
			// Install event handlers:
			['click', 'mousedown', 'mouseup', 'mousemove'].each (function (event_name) {
				this.element.observe (event_name, this['__surface_' + event_name].bind (this))
			}.bind (this));
		},

	enable:
		function()
		{
			this.enabled = true
			this.update()
			this.items.invoke ('update')
		},

	disable:
		function()
		{
			this.enabled = false
		},

	get_extents:
		function()
		{
			var d = { w: this.canvas.width, h: this.canvas.height }
			return {
				min: this.__canvas_to_surface ({ x: 0, y: 0 }),
				max: this.__canvas_to_surface ({ x: d.w-1, y: d.h-1 })
			}
		},

	set_grid:
		function (x, y, attract)
		{
			if (this.options.grid.x != x || this.options.grid.y != y)
			{
				if (this.grid)
					this.grid.invoke ('remove')
				this.grid = null
				this.options.grid = { x: x, y: y }
				this.update()
			}
			this.options.grid.attract = attract
		},

	insert_item:
		function (item, before_index)
		{
			if (before_index !== null)
				this.items.splice (before_index, 0, item)
			else
				this.items.push (item)
			this.update()
		},

	remove_item:
		function (item)
		{
			item.destroy()
			var i = this.items.indexOf (item)
			if (i > -1)
				this.items.splice (i, 1)
			this.update()
		},

	remove_items:
		function (items)
		{
			items.each (function (item) {
				item.destroy()
				this.items = this.items.reject (function (i) { return items.include (i) })
			}.bind (this))
			this.update()
		},

	rotate:
		function (direction)
		{
			if (typeof direction == 'string')
			{
				this.items.each (function (item) {
					var p = item.get_position()
					var r = item.get_rotation()
					if (direction == 'left')
					{
						item.set_position (p.y, -p.x, true)
						item.set_rotation (r - 90)
					}
					else if (direction == 'right')
					{
						item.set_position (-p.y, p.x, true)
						item.set_rotation (r + 90)
					}
				})
			}
			this.update()
		},

	find_items_in_range:
		function (a, b)
		{
			var min_x = Math.min (a.x, b.x)
			var max_x = Math.max (a.x, b.x)
			var min_y = Math.min (a.y, b.y)
			var max_y = Math.max (a.y, b.y)
			return this.items.select (function (item) {
				var p = item.get_position()
				return min_x <= p.x && p.x <= max_x && min_y <= p.y && p.y <= max_y
			})
		},

	find_items_with_tag:
		function (tag)
		{
			return this.items.select (function (item) { return item.has_tag (tag) })
		},

	find_items_without_tag:
		function (tag)
		{
			return this.items.reject (function (item) { return item.has_tag (tag) })
		},

	update:
		function()
		{
			if (this.enabled)
				this.redraw()
		},

	redraw:
		function()
		{
			this.__draw_grid()
		},

	//
	// New callbacks:
	//

	before_click:
		function (item) { },

	after_click:
		function (item) { },

	before_mouseover:
		function (item) { },

	after_mouseover:
		function (item) { },

	before_mouseout:
		function (item) { },

	after_mouseout:
		function (item) { },

	before_move:
		function (items) { },

	after_move:
		function (items) { },

	after_selection:
		function() { },

	//
	// Privates
	//

	// Gets pointer/mouse position from event relative to nearest positioned element.
	__event_position:
		function (event)
		{
			// For Firefox:
			if (typeof event.layerX != 'undefined')
				return { x: event.layerX, y: event.layerY };
			// For Opera, etc:
			else
			{
				var o = this.element.cumulativeOffset()
				return { x: event.pageX - o[0], y: event.pageY - o[1] }
			}
		},

	// Translates point from surface ((0,0) at center) to canvas ((0, 0) at top left corner) coordinate system.
	__surface_to_canvas:
		function (position)
		{
			return { x: position.x + this.options.center.x, y: position.y + this.options.center.y }
		},

	// Translates point from canvas to surface coordinate system.
	__canvas_to_surface:
		function (position)
		{
			return { x: position.x - this.options.center.x, y: position.y - this.options.center.y }
		},

	// Translates mouse point from event to canvas coordinate system.
	__event_to_canvas:
		function (event)
		{
			return this.__event_position (event)
		},

	// Translates mouse point from event to surface coordinate system.
	__event_to_surface:
		function (event)
		{
			return this.__canvas_to_surface (this.__event_position (event))
		},

	__draw_grid:
		function()
		{
			if (this.grid)
				return
			this.grid = []
			var d = this.element.getDimensions()
			var g = this.options.grid
			var e = this.get_extents()
			// Vertical lines:
			if (g.x > 2)
			{
				var line = function (x)
				{
					var p0 = this.__surface_to_canvas ({ x: x, y: e.min.y - 1 })
					var p1 = this.__surface_to_canvas ({ x: x, y: e.max.y + 1 })
					this.grid.push (this.canvas.path ({ stroke: ((x / g.x) % 5) ? '#66f' : 'red', 'stroke-width': 0.15 }).absolutely().moveTo (p0.x + 0.5, p0.y).lineTo (p1.x + 0.5, p1.y).andClose())
				}.bind (this)
				for (var x = 0; x < e.max.x; x += g.x)
					line (x)
				for (var x = -g.x; x > e.min.x; x -= g.x)
					line (x)
			}
			// Horizontal lines:
			if (g.y > 2)
			{
				var line = function (y)
				{
					var p0 = this.__surface_to_canvas ({ x: e.min.x - 1, y: y })
					var p1 = this.__surface_to_canvas ({ x: e.max.x + 1, y: y })
					this.grid.push (this.canvas.path ({ stroke: ((y / g.y) % 5) ? '#66f' : 'red', 'stroke-width': 0.15 }).absolutely().moveTo (p0.x, p0.y).lineTo (p1.x, p1.y).andClose())
				}.bind (this)
				for (var y = 0; y < e.max.y; y += g.y)
					line (y)
				for (var y = -g.y; y > e.min.y; y -= g.y)
					line (y)
			}
			this.grid.invoke ('toBack')
		},

	__item_click:
		function (item, event)
		{
			if (!this.supress_item_click && this.before_click (item) !== false)
			{
				// Unselect other items unless Ctrl is pressed:
				if (this.options.selections.multiselect || event.ctrlKey)
				{
					if (item.was_selected_before_mousedown)
					{
						if (item.toggle_tag ('selected'))
							this.after_selection()
					}
				}
				else
				{
					if ((s = this.find_items_with_tag ('selected')).length > 1)
					{
						s.invoke ('set_tag', 'selected', false)
						if (item.set_tag ('selected', true))
							this.after_selection()
					}
				}
				this.after_click (item)
			}
			this.supress_item_click = false
			event.stopPropagation()
		},

	__item_mouseover:
		function (item, event)
		{
			if (this.before_mouseover (item) !== false)
				this.after_mouseover (item)
		},

	__item_mouseout:
		function (item, event)
		{
			if (this.before_mouseout (item) !== false)
				this.after_mouseout (item)
		},

	__item_mousedown:
		function (item, event)
		{
			item.was_selected_before_mousedown = item.has_tag ('selected')
			item.to_front && item.to_front()
			// Start selection?
			if (this.options.selections.click)
			{
				if (item.has_tag ('selected') || event.ctrlKey || this.options.selections.multiselect)
					item.set_tag ('selected', true)
				else
				{
					this.find_items_with_tag ('selected').invoke ('set_tag', 'selected', false)
					item.set_tag ('selected', true)
				}
			}
			// Move items?
			if (this.options.allow_moving)
			{
				var s = this.find_items_with_tag ('selected')
				this.moved_items = s.length
					? [item, s].flatten().uniq()
					: [item]
				var p = item.get_position()
				var e = this.__event_to_surface (event)
				this.anchored_at = { x: (e.x - p.x) || 0, y: (e.y - p.y) || 0 }
			}
		},

	__item_mouseup:
		function (item, event)
		{
			this.__surface_mouseup()
			item.redraw()
		},

	__item_mousemove:
		function (item, event)
		{
			return false
		},

	__surface_click:
		function (event)
		{
			if (this.options.selections.bg_unselect)
			{
				var s = this.find_items_with_tag ('selected')
				if (s.length > 0)
					s.invoke ('set_tag', 'selected', false)
			}
		},

	__surface_mousedown:
		function (event)
		{
			// Prevent browser from dragging object (FX):
			event.preventDefault()
			// Create new selection if allowed:
			if (this.selection)
				this.selection.destroy()
			if (this.options.selections.box)
				this.selection = new Surface.Selection (this, this.__event_to_canvas (event))
		},

	__surface_mouseup:
		function (event)
		{
			if (this.options.selections.box)
			{
				var selection_changed = this.selection? this.selection.changed() : true
				// Clear selection if exist:
				if (this.selection)
					this.selection.destroy()
				this.selection = null
				// Drop moved items:
				this.moved_items = []
				// Selection update:
				if (selection_changed)
					this.after_selection()
			}
		},

	__surface_mousemove:
		function (event)
		{
			// Prevent browser from dragging object (MSIE):
			event.preventDefault()
			// Move items:
			if (this.moved_items.length > 0)
			{
				if (this.before_move (this.moved_items) !== false)
				{
					// Supress awaiting click event on item:
					this.supress_item_click = true
					// Compute movement:
					var a = this.__event_to_surface (event)
					a.x -= this.anchored_at.x
					a.y -= this.anchored_at.y
					var p = this.moved_items[0].get_position()
					// Move delta:
					var d = { x: a.x - p.x, y: a.y - p.y }
					this.moved_items.each (function (item) {
						var p = item.get_position()
						item.set_position (p.x + d.x, p.y + d.y)
						if (this.options.grid.attract)
							item.align_to_grid()
					}.bind (this))
					this.after_move (this.moved_items)
				}
			}
			else
			{
				if (this.selection)
					this.selection.update (this.__event_to_canvas (event))
			}
			return false
		}
})


/**
 * Saves/restores tags set on items with the same id.
 */
Surface.TagSaver = Class.create ({
	initialize:
		function (surface)
		{
			this.surface = surface
			this.saved = {}
		},

	// Returns true if lock was obtained.
	save:
		function()
		{
			this.saved = {}
			this.surface.items.each (function (item) {
				if (item.data && item.data.struct && item.data.struct.id)
					this.saved[item.data.struct.id] = item.tags
			}.bind (this))
		},

	restore:
		function()
		{
			this.surface.items.each (function (item) {
				if (item.data && item.data.struct && item.data.struct.id)
				{
					var tags = this.saved[item.data.struct.id]
					if (tags)
					{
						$H(tags).each (function (pair) { item.set_tag (pair.key, pair.value) })
						item.update()
					}
				}
			}.bind (this))
		}
})


/**
 * Represents selection box, drawn on Surface.
 */
Surface.Selection = Class.create ({
	initialize:
		function (surface, canvas_pos)
		{
			this.surface = surface
			this.canvas = surface.canvas
			this.start_pos = Object.clone (canvas_pos)
			this.end_pos = Object.clone (canvas_pos)
			this.previously_selected_items = this.surface.find_items_with_tag ('selected')
			if (this.surface.enabled)
				this.redraw()
		},

	// Deletes selection rectangle from canvas:
	destroy:
		function()
		{
			this.rect.remove()
		},

	changed:
		function()
		{
			var s = this.surface.find_items_with_tag ('selected')
			if (s.length != this.previously_selected_items.length)
				return true
			return false
		},

	// Updates selection rectangle:
	update:
		function (canvas_pos)
		{
			this.end_pos = Object.clone (canvas_pos)
			// Set tag 'selected' on items in selection range:
			var s1 = this.surface.find_items_in_range (this.surface.__canvas_to_surface (this.start_pos), this.surface.__canvas_to_surface (this.end_pos))
			var s0 = this.surface.items.reject (function (item) { return s1.include (item) })
			s1.invoke ('set_tag', 'selected', true)
			s0.invoke ('set_tag', 'selected', false)
			if (this.surface.enabled)
				this.redraw()
		},

	redraw:
		function()
		{
			if (this.rect)
				this.rect.remove()
			a = this.start_pos
			b = this.end_pos
			this.rect = this.canvas.rect (Math.min (a.x, b.x), Math.min (a.y, b.y), (a.x - b.x).abs(), (a.y - b.y).abs(), 0)
			this.rect.attr ({ fill: 'rgb(0, 20, 100)', 'fill-opacity': 0.3, stroke: 'navy', 'stroke-width': 0.35 })
		}
})


/**
 * Represents message shown on Surface.
 */
Surface.Message = Class.create ({
	initialize:
		function (surface, message)
		{
			this.surface = surface
			var dim = new Element ('div', { 'class': 'message-dim' })
			var box1 = new Element ('div', { 'class': 'message-box1' })
			var box2 = new Element ('p', { 'class': 'message-box2' })
			box1.appendChild (box2)
			box2.update (message)
			dim.appendChild (box1)
			this.surface.element.appendChild (dim)
			this.dim = dim
		},

	close:
		function()
		{
			this.dim.fade ({
				duration: 0.3,
				transition: Effect.Transitions.sinoidal,
				afterFinish: function() {
					this.dim.parentNode.removeChild (this.dim)
				}.bind (this)
			})
		}
})


/**
 * Represents waiting indicator shown on Surface.
 */
Surface.WaitingIndicator = Class.create ({
	initialize:
		function (surface, html_message)
		{
			this.surface = surface
			this.div = new Element ('div', { 'class': 'waiting-box' })
			this.div.update ('<p><span>#{text}</span></p>'.interpolate ({ text: html_message || '' }))
			this.surface.element.appendChild (this.div)
		},

	close:
		function()
		{
			this.div.fade ({
				duration: 0.2,
				transition: Effect.Transitions.sinoidal,
				afterFinish: function() {
					this.div.parentNode.removeChild (this.div)
				}.bind (this)
			})
		}
})


/**
 * Allows aligning and spreading objects.
 */
Surface.Aligner = Class.create ({
	initialize:
		function (surface)
		{
			this.surface = surface
		},

	align_horizontally:
		function()
		{
			var selected = this.surface.find_items_with_tag ('selected')
			// Calculate average y:
			var avg = selected.inject (0, function (m, item) { return m + item.get_position().y }) / parseFloat (selected.length)
			// Move objects:
			this.surface.find_items_with_tag ('selected').each (function (item) {
				item.set_position (null, avg)
			})
		},

	align_vertically:
		function()
		{
			var selected = this.surface.find_items_with_tag ('selected')
			// Calculate average x:
			var avg = selected.inject (0, function (m, item) { return m + item.get_position().x }) / parseFloat (selected.length)
			// Move objects:
			this.surface.find_items_with_tag ('selected').each (function (item) {
				item.set_position (avg, null)
			})
		},

	spread_horizontally:
		function()
		{
			var selected = this.surface.find_items_with_tag ('selected').sort (function (item1, item2) { return item1.get_position().x > item2.get_position().x })
			if (selected.length > 2)
			{
				// Calculate min/max x:
				var min = selected.first().get_position().x
				var max = selected.last().get_position().x
				var delta = (max - min) / (selected.length - 1)
				// Spread items:
				selected.each (function (item, index) {
					item.set_position (min + index * delta, null)
				})
			}
		},

	spread_vertically:
		function()
		{
			var selected = this.surface.find_items_with_tag ('selected').sort (function (item1, item2) { return item1.get_position().y > item2.get_position().y })
			if (selected.length > 2)
			{
				// Calculate min/max y:
				var min = selected.first().get_position().y
				var max = selected.last().get_position().y
				var delta = (max - min) / (selected.length - 1)
				// Spread items:
				selected.each (function (item, index) {
					item.set_position (null, min + index * delta)
				})
			}
		},

	__item_x:
		function (item)
		{
			return item.get_position().x
		},

	__item_y:
		function (item)
		{
			return item.get_position().y
		}
})


/**
 * Represents item on surface (point, shape, etc).
 */
Surface.Item = Class.create ({
	initialize:
		function (surface)
		{
			this.surface = surface
			this.tags = {}

			this.size = { w: 0, h: 0 }
			this.position = { x: 0, y: 0 }
			this.rotation = 0

			this.canvas = this.surface.canvas
		},

	destroy:
		function()
		{
		},

	set_size:
		function (w, h, dont_update)
		{
			w && (this.size.w = w)
			h && (this.size.h = h)
			dont_update || this.update()
		},

	get_size:
		function()
		{
			return Object.clone (this.size)
		},

	set_position:
		function (x, y, dont_update)
		{
			var e = this.surface.get_extents()
			if (x !== null)
				this.position.x = Math.min (Math.max (x, e.min.x), e.max.x)
			if (y !== null)
				this.position.y = Math.min (Math.max (y, e.min.y), e.max.y)
			dont_update || this.update()
		},

	get_position:
		function()
		{
			return Object.clone (this.position)
		},

	set_rotation:
		function (angle_deg, dont_update)
		{
			this.rotation = (angle_deg % 360)
			dont_update || this.update()
		},

	get_rotation:
		function()
		{
			return this.rotation
		},

	align_to_grid:
		function()
		{
			var g = this.surface.options.grid
			var a = this.get_position()
			a.x = (a.x / g.x).round() * g.x
			a.y = (a.y / g.y).round() * g.y
			this.set_position (a.x, a.y)
		},

	install_handlers:
		function (node)
		{
			['click', 'mouseover', 'mouseout', 'mousedown', 'mouseup', 'mousemove'].each (function (event_name) {
				node['on' + event_name] = function (event) {
					this.surface['__item_' + event_name](this, event)
				}.bind (this)
			}.bind (this))
		},

	update:
		function()
		{
			if (this.surface.enabled)
				this.redraw()
		},

	redraw:
		function()
		{
		},

	set_baloon:
		function (visible)
		{
			// TODO właśnie to trzeba zrobić, tj. wyświetlać jakieś sensowne informacje w dymku.
			if (visible && !this.baloon)
			{
				var pos = this.surface.__surface_to_canvas (this.get_position())
				var siz = this.get_size()
				pos.x += siz.w / 2
				pos.y -= siz.h / 2
				this.baloon = new Element ('div', { 'class': 'item-baloon' })
				this.surface.element.appendChild (this.baloon)

				if (this.data.nonsmoking)
				{
					var img = new Element ('img', {
						src: Infopedia.base_href + '/images/surface/nonsmoking.png',
						title: 'Dla niepalących', alt: '[Dla niepalących]',
						style: 'display: block; margin: 0.25em'
					})
					this.baloon.appendChild (img)
				}

				if (this.data.struct.seats)
				{
					var seats = new Element ('p', { 'class': 'seats' })
					seats.update ('Miejsc: ' + this.data.struct.seats)
					this.baloon.appendChild (seats)
				}

				var inf = new Element ('p', { 'class': 'item-status' })

//				if ([Room.Mode.USER_RESERVATION, Room.Mode.ADMIN_RESERVATION].include (this.surface.options.mode))
//				{
//					if (this.selected)
//						inf += '<p class="item-status selected">Twoja rezerwacja</p>'
//					else
//					{
//						if (this.data.free)
//							inf += '<p class="item-status free">Miejsce wolne</p>'
//						else
//							inf += '<p class="item-status reserved">Miejsce zarezerwowane</p>'
//					}
//				}
//				else
				if (true)
				{
					if (this.has_tag ('selected'))
					{
						inf.addClassName ('selected')
						inf.update ('Rezerwacja')
					}
					else
					{
						if (this.data.free)
						{
							inf.addClassName ('free')
							inf.update ('Wolne')
						}
						else
						{
							inf.addClassName ('reserved')
							inf.update ('Rezerwacja')
						}
					}
				}
				this.baloon.appendChild (inf)

				var dim = this.baloon.getDimensions()
				this.baloon.setStyle ({ left: pos.x + 'px', top: pos.y - dim.height + 'px' })
				this.baloon.switchClassNames (this.data.struct.free, 'free', 'reserved')
				if (this.data.reserved_in_future)
					this.baloon.addClassName ('reserved-in-future')
			}
			else if (this.baloon)
			{
				this.baloon.parentNode.removeChild (this.baloon)
				delete this.baloon
			}
		},

	// Surface items have tags. Tag can be any string.
	// Following tags have special meaning:
	//   selected - when item is selected.

	set_tag:
		function (tag, value)
		{
			var changed = !!this.tags[tag] != value
			if (changed && this.before_tag (tag, value) !== false)
			{
				this.tags[tag] = value
				this.update()
				this.after_tag (tag, value)
				return true
			}
			return false
		},

	has_tag:
		function (tag)
		{
			return this.tags[tag] == true
		},

	toggle_tag:
		function (tag)
		{
			return this.set_tag (tag, !this.has_tag (tag))
		},

	//
	// New callbacks
	//

	before_tag:
		function (tag, set) { },

	after_tag:
		function (tag, set) { }
})



var AreaEditor = Class.create (Surface, {
	// Creates new point or alerts when it is impossible.
	create_point:
		function()
		{
			var new_item = null
			// For creation two neighbouring points must be selected.
			// New point will be created just between them.
			//
			// If there is 1 or 0 points, just add newly created point to
			// end of the list.
			if (this.items.length <= 2)
			{
				// Unselect other items:
				this.items.invoke ('set_tag', 'selected', false)
				// Create new item:
				new_item = new AreaEditor.Point (this)
				this.insert_item (new_item, 0)
				new_item.set_position (0, 0)
				if (this.options.grid.attract)
					new_item.align_to_grid()
				new_item.set_tag ('selected', true)
			}
			else
			{
				var s = this.find_items_with_tag ('selected')
				if (s.length != 2)
					alert ('Zaznacz dwa sąsiednie punkty, między którymi chcesz dodać nowy.')
				else
				{
					// Check if items are neighbours:
					var n = this.items.length
					var p = [s[0].get_position(), s[1].get_position()]
					var i = [this.items.indexOf (s[0]), this.items.indexOf (s[1])]
					i = [i.min(), i.max()]
					if (i[0] + 1 == i[1] || (i[0] == 0 && i[1] == n-1))
					{
						new_item = new AreaEditor.Point (this)
						this.insert_item (new_item, (i[0] == 0 && i[1] == n-1)? 0 : i[1])
						new_item.set_position ((p[0].x + p[1].x) / 2, (p[0].y + p[1].y) / 2)
						if (this.options.grid.attract)
							new_item.align_to_grid()
						new_item.set_tag ('selected', true)
						// Unselect previous items:
						s.invoke ('set_tag', 'selected', false)
					}
					else
						alert ('Zaznacz dwa sąsiednie punkty.')
				}
			}
			this.update()
			return new_item
		},

	// Removes selected points.
	destroy_points:
		function()
		{
			var s = this.find_items_with_tag ('selected')
			if (s.length == 0)
				alert ('Zaznacz punkty do usunięcia')
			else
			{
				this.remove_items (s)
				this.update()
				return true
			}
		},

	// Creates area from array of points ([x,y]).
	set_area_points:
		function (points)
		{
			this.remove_items (this.items)
			points.each (function (pair) {
				var item = new AreaEditor.Point (this)
				this.insert_item (item)
				item.set_position (pair[0], pair[1])
			}.bind (this))
			this.update()
		},

	// Returns array of point coordinates.
	get_area_points:
		function()
		{
			return this.items.collect (function (item) {
				var p = item.get_position()
				return [p.x, p.y]
			})
		},

	// Loads area from server.
	load:
		function()
		{
			if (this.load_request)
				this.load_request.transport.abort()
			this.load_request_message = new Surface.WaitingIndicator (this, 'Odczytywanie')
			this.load_request = new Ajax.Request (URL.room_load_url, {
				method: 'get',
				parameters:
					{ rooms: [{ room_id: this.options.room_id, area: true }].toJSON() },
				onSuccess:
					function (transport) {
						this.set_area_points (transport.responseText.evalJSON (false)[0].area)
					}.bind (this),
				onFailure:
					function (transport) {
						alert ("Komunikat serwera:\n\n" + transport.responseText)
					},
				onComplete:
					function (transport) {
						this.load_request_message.close()
						this.after_load()
					}.bind (this)
			})
		},

	// Stores area on server.
	save:
		function()
		{
			if (this.save_request)
				this.save_request.transport.abort()
			this.save_request_message = new Surface.WaitingIndicator (this, 'Zapisywanie')
			this.save_request = new Ajax.Request (URL.room_save_url, {
				method: 'post',
				parameters:
					{ authenticity_token: window.authenticity_token, rooms: [{ room_id: this.options.room_id, area: this.get_area_points() }].toJSON() },
				onFailure:
					function (transport) {
						alert ("Komunikat serwera:\n\n" + transport.responseText)
					},
				onComplete:
					function (transport) {
						this.save_request_message.close()
						this.after_save()
					}.bind (this)
			})
		},

	redraw:
		function ($super)
		{
			$super()
			if (this.area_path)
			{
				this.area_path.remove()
				this.area_path = null
			}
			if (this.items.length > 0)
			{
				var p = this.__surface_to_canvas (this.items[0].get_position())
				this.area_path = this.canvas.path ({ stroke: '#2F356E', fill: 'rgb(221, 255, 221)', 'stroke-width': 1.5 }).absolutely().moveTo (p.x, p.y)
				this.items.each (function (item) {
					var p = this.__surface_to_canvas (item.get_position())
					this.area_path.lineTo (p.x, p.y)
				}.bind (this))
				this.area_path.andClose()
				this.area_path.toBack()
			}
		},

	//
	// Implemented callbacks
	//

	after_move:
		function (items)
		{
			this.update()
		},

	//
	// New callbacks
	//

	after_load:
		function() { },

	after_save:
		function() { }
})


AreaEditor.Point = Class.create (Surface.Item, {
	initialize:
		function ($super, surface)
		{
			$super (surface)

			this.set_size (8, 8);
		},

	destroy:
		function ($super)
		{
			if (this.object)
				this.object.remove()
			$super()
		},

	redraw:
		function ($super)
		{
			if (!this.object)
			{
				this.object = this.canvas.circle (0, 0, 1)
				this.install_handlers (this.object.node)
			}
			var pos = this.surface.__surface_to_canvas (this.get_position())
			var siz = this.get_size()
			this.object.attr ({ fill: this.has_tag ('selected')? '#388' : '#fff', 'stroke-width': 1, cx: pos.x, cy: pos.y, r: siz.w / 2 })
			this.object.rotate (this.rotation, true)
		},

	to_front:
		function()
		{
			if (!Prototype.Browser.Opera)
				this.object.toFront()
		}
})


/**
 * Allows to display room and its items.
 */
var Room = Class.create (Surface, {
	initialize:
		function ($super, element, options)
		{
			$super (element, options)

			this.area_points = []
		},

	redraw:
		function ($super)
		{
			$super()
			this.__draw_background()
		},

	// Restores onscreen-items from items:
	load_data:
		function (room_data)
		{
			if (this.load_warning)
			{
				this.load_warning.close()
				this.load_warning = null
			}
			this.remove_items (this.items)
			if (typeof room_data.items == 'string')
			{
				this.area_points = []
				this.load_warning = new Surface.Message (this, room_data.items)
			}
			else
			{
				// Update area:
				this.area_points = room_data.area
				// Update items:
				if (room_data.items)
				{
					room_data.items.each (function (item_data) {
						var item = this.create_item_object (item_data)
						this.insert_item (item)
						item.update()
					}.bind (this))
				}
			}
			this.update()
		},

	// Loads area and items from server.
	load:
		function (datetime)
		{
			if (this.options.tag_saver && !this.load_warning)
				this.tag_saver.save()
			if (this.load_request)
				this.load_request.transport.abort()
			this.load_request_message = new Surface.WaitingIndicator (this, 'Odczytywanie')
			this.load_request = new Ajax.Request (URL.room_load_url, {
				method: 'get',
				parameters:
					{ rooms: [{ room_id: this.options.room_id, area: true, items: true, datetime: datetime }].toJSON() },
				onSuccess:
					function (transport) {
						this.load_data (transport.responseText.evalJSON (false)[0])
						if (this.options.tag_saver && !this.load_warning)
							this.tag_saver.restore()
					}.bind (this),
				onFailure:
					function (transport) {
						alert ("Komunikat serwera:\n\n" + transport.responseText)
					},
				onComplete:
					function (transport) {
						this.load_request_message.close()
						this.after_load()
					}.bind (this)
			})
		},

	create_item_object:
		function (item_data)
		{
			return new Room.Item (this, item_data)
		},

	// Draws polygonal room shape.
	__draw_background:
		function()
		{
			if (this.area_path)
			{
				this.area_path.remove()
				this.area_path = null
			}
			if (this.area_points.length > 0)
			{
				var p = this.__surface_to_canvas ({ x: this.area_points[0][0], y: this.area_points[0][1] })
				this.area_path = this.canvas.path ({ stroke: '#2F356E', fill: '#C3DEFF' /* #FFDD66 */, 'stroke-width': 1.5 }).absolutely().moveTo (p.x, p.y)
				this.area_points.each (function (point) {
					var p = this.__surface_to_canvas ({ x: point[0], y: point[1] })
					this.area_path.lineTo (p.x, p.y)
				}.bind (this))
				this.area_path.andClose()
				this.area_path.toBack()
			}
		},

	//
	// Implemented callbacks
	//

	after_mouseover:
		function (item)
		{
			if (item.before_hover() !== false)
			{
				item.hovered = true
				item.redraw()
			}
			if (this.options.show_baloons && item.data.struct.reservable && !item.baloon)
				item.set_baloon (true)
		},

	after_mouseout:
		function (item)
		{
			if (item.hovered)
			{
				item.hovered = false
				item.redraw()
			}
			if (item.baloon)
				item.set_baloon (false)
		},

	after_selection:
		function()
		{
			this.find_items_with_tag ('selected').select (function (item) { return !item.selected_ticket }).each (function (item) {
				if (item.is_ticketed())
					item.open_ticket_selector()
			})
		},

	//
	// New callbacks
	//

	after_load:
		function() { }
})


Room.Item = Class.create (Surface.Item, {
	initialize:
		function ($super, surface, data)
		{
			$super (surface)

			if (!data)
			{
				data = {
					struct: {
						pos: { x: -this.surface.options.center.x + 20, y: -this.surface.options.center.y + 20 },
						size: { w: 18, h: 18 },
						rotation: 0,
						name: '',
						id: null,
						reservation_price: null,
						reservable: false,
						nonsmoking: false,
						seats: null
					}
				}
			}

			this.data = data
			this.hovered = false
			this.selected_ticket = null
			this.reserved = data.reserved || false
			this.reserved_in_future = data.reserved_in_future || false

			this.set_position (this.data.struct.pos.x, this.data.struct.pos.y)
			this.set_size (this.data.struct.size.w, this.data.struct.size.h)
			this.set_rotation (this.data.struct.rotation)
		},

	set_reserved:
		function (set)
		{
			this.reserved = set
			this.update()
		},

	set_reserved_in_future:
		function (set)
		{
			this.reserved_in_future = set
			this.update()
		},

	destroy:
		function ($super)
		{
			this.close_ticket_selector()
			if (this.object)
				this.object.remove()
			if (this.object_label)
				this.object_label.remove()
			$super()
		},

	serialize:
		function()
		{
			this.data.struct.pos = this.get_position()
			this.data.struct.rotation = this.get_rotation()
			return Object.clone (this.data)
		},

	redraw:
		function()
		{
			if (this.previous_name != this.data.struct.name)
			{
				this.object_label && this.object_label.remove()
				this.object_label = null
			}
			if (!this.object)
			{
				this.object = this.canvas.rect (0, 0, 1, 1, 2)
				this.install_handlers (this.object.node)
			}
			if (!this.object_label)
			{
				this.object_label = this.canvas.text (0, 0, this.data.struct.name? this.data.struct.name : ' ')
				this.install_handlers (this.object_label.node)
			}
			var pos = this.surface.__surface_to_canvas (this.get_position())
			var siz = this.get_size()

			var fill = '#fff'
			var stroke = '#000'
			var text = '#000'
			var stroke_width = 1
			if (!this.data.struct.reservable)
			{
				fill = '#DDECFF'
				stroke_width = 0.5
			}
			if (this.reserved_in_future)
			{
				fill = '#FFDD00'
				text = '#000'
			}
			if (this.reserved)
			{
				fill = '#F03333'
				text = '#fff'
			}
			if (this.has_tag ('selected'))
			{
				fill = '#00DC04'
				text = '#fff'
				if (this.reserved_in_future)
				{
					stroke = '#FFDD00'
					stroke_width = 2
				}
				if (this.reserved)
				{
					stroke = '#F03333'
					stroke_width = 2
				}
			}

			this.object.attr ({ x: pos.x - siz.w/2, y: pos.y - siz.h/2, width: siz.w, height: siz.h - 0.075, fill: fill, stroke: stroke, 'stroke-width': stroke_width, cursor: this.data.struct.reservable? 'pointer' : 'default' })
			this.object.rotate (this.rotation, true)
			this.object_label.attr ({ x: pos.x, y: pos.y + 3, style: 'font-family: Arial; font-size: 10px;', fill: text, cursor: 'pointer' })
			this.object_label.rotate (this.rotation, true)

			this.previous_name = this.data.struct.name
		},

	to_front:
		function()
		{
			if (!Prototype.Browser.Opera)
			{
				this.object.toFront()
				this.object_label.toFront()
			}
		},

	is_ticketed:
		function()
		{
			return !!this.data.tickets
		},

	open_ticket_selector:
		function()
		{
			this.close_ticket_selector()

			// <select>:
			var select = new Element ('select', { 'class': 'tickets-select' })
			this.ticket_selector = select

			// First <option>:
			var option = new Element ('option', { 'class': 'default' })
			option.update ('— Wybierz rodzaj biletu —')
			option.value = null
			select.appendChild (option)

			// On change:
			select.onchange = function() {
				if (this.value !== null)
				{
					this.selected_ticket = this.ticket_selector.value.evalJSON (false)
					this.close_ticket_selector()
					this.after_ticket_selection()
				}
			}.bind (this)

			// Ticket types:
			if (!(this.data.tickets instanceof Array))
			{
				$H(this.data.tickets).each (function (pair) {
					var option = new Element ('option', { value: Object.toJSON (pair.value) })
					option.update ('<b>#{name}</b> #{description} (#{price} zł)'.interpolate ({ name: h(pair.value.category_name), price: h(pair.value.price), description: h(pair.value.description) }))
					select.appendChild (option)
				}.bind (this))
			}

			var p = this.surface.__surface_to_canvas (this.get_position())
			var d = this.surface.element.positionedOffset()
			var s = this.get_size()
			select.setStyle ({ position: 'absolute', top: p.y + d.top - s.h/2 + 'px', left: p.x + d.left + s.w/2 + 1 + 'px' })

			this.surface.element.appendChild (select)
		},

	close_ticket_selector:
		function()
		{
			if (this.ticket_selector)
			{
				this.ticket_selector.parentNode.removeChild (this.ticket_selector)
				this.ticket_selector = null
			}
		},

	//
	// Implemented callbacks
	//

	after_tag:
		function (tag, set)
		{
			if (tag == 'selected' && this.is_ticketed())
			{
				if (set)
				{
					if (this.selected_ticket)
						this.surface.rooms && this.surface.rooms.update_summary()
					else
						this.open_ticket_selector()
				}
				else
				{
					this.close_ticket_selector()
					this.selected_ticket = null
				}
			}
		},

	//
	// New callbacks
	//

	before_hover:
		function() { },

	after_ticket_selection:
		function() { }
})


/**
 * Allows for editing and saving items.
 */
var RoomEditor = Class.create (Room, {
	initialize:
		function ($super, element, options, settings_element)
		{
			$super (element, options)

			this.item_settings = new RoomEditor.ItemSettings (this, settings_element)
			this.items_to_destroy = []
		},

	create_item:
		function()
		{
			var item = new Room.Item (this)
			this.insert_item (item)
			item.update()
			this.item_settings.update()
			return true
		},

	destroy_items:
		function()
		{
			var s = this.find_items_with_tag ('selected')
			if (s.length > 0)
			{
				this.items_to_destroy = this.items_to_destroy.concat (s.select (function (item) { return item.data.struct.id != undefined }))
				this.remove_items (s)
				this.item_settings.update()
				return true
			}
		},

	// Creates items array from onscreen-items:
	save_data:
		function()
		{
			return this.items.collect (function (item) { return item.serialize() })
		},

	save_items_to_destroy:
		function()
		{
			return this.items_to_destroy.collect (function (item) { return item.serialize() })
		},

	// Stores items on server.
	save:
		function()
		{
			if (this.save_request)
				this.save_request.transport.abort()
			this.save_request_message = new Surface.WaitingIndicator (this, 'Zapisywanie')
			this.save_request = new Ajax.Request (URL.room_save_url, {
				method: 'post',
				parameters:
					{ authenticity_token: window.authenticity_token, rooms: [{ room_id: this.options.room_id, items: this.save_data(), remove_items: this.save_items_to_destroy() }].toJSON() },
				onSuccess:
					function (transport) {
						this.load()
					}.bind (this),
				onFailure:
					function (transport) {
						alert ("Komunikat serwera:\n\n" + transport.responseText)
					},
				onComplete:
					function (transport) {
						this.save_request_message.close()
						this.after_save()
					}.bind (this)
			})
		},

	//
	// Implemented callbacks
	//

	after_selection:
		function ($super)
		{
			$super()
			this.item_settings.update()
		},

	after_load:
		function()
		{
			this.item_settings.update()
		},

	//
	// New callbacks
	//

	after_settings_changed:
		function() { },

	after_save:
		function() { }
})


RoomEditor.ItemSettings = Class.create ({
	initialize:
		function (surface, element)
		{
			this.surface = surface
			this.element = $(element)
			this.form = this.element.select ('form')[0]
			this.selected_items = []

			var t = this

			this.params = {
				reservable: {
					change:	this.form.select ('li.param-reservable .change input')[0],
					input:	this.form.select ('li.param-reservable .field input')[0],
					update:	function (item) { this.input.checked = item.data.struct.reservable },
					reset:	function() { this.input.checked = false }
				},
				nonsmoking: {
					change:	this.form.select ('li.param-nonsmoking .change input')[0],
					input:	this.form.select ('li.param-nonsmoking .field input')[0],
					update:	function (item) { this.input.checked = item.data.struct.nonsmoking },
					reset:	function() { this.input.checked = false }
				},
				name: {
					change:	this.form.select ('li.param-name .change input')[0],
					input:	this.form.select ('li.param-name .field input')[0],
					update:	function (item) { this.input.value = item.data.struct.name },
					reset:	function() { this.input.value = '' }
				},
				seats: {
					change:	this.form.select ('li.param-seats .change input')[0],
					input:	this.form.select ('li.param-seats .field input')[0],
					update:	function (item) { this.input.value = item.data.struct.seats },
					reset:	function() { this.input.value = '' }
				},
				reservation_price: {
					change:	this.form.select ('li.param-reservation_price .change input')[0],
					input:	this.form.select ('li.param-reservation_price .field input')[0],
					update:	function (item) { this.input.value = item.data.struct.reservation_price },
					reset:	function() { this.input.value = '' }
				},
				description: {
					change:	this.form.select ('li.param-description .change input')[0],
					input:	this.form.select ('li.param-description .field input')[0],
					update:	function (item) { this.input.value = item.data.struct.description },
					reset:	function() { this.input.value = '' }
				},
				rotation: {
					change:	this.form.select ('li.param-rotation .change input')[0],
					input:	this.form.select ('li.param-rotation .field input')[0],
					slider:	new Control.Slider (
						this.form.select ('li.param-rotation .field .slider .handle')[0],
						this.form.select ('li.param-rotation .field .slider')[0],
						{
							range: $R(-180, 180),
							sliderValue: 0,
							onSlide: function (value) {
								t.params.rotation.input.value = value
								t.params.rotation.input.onchange()
							}
						}
					),
					update:	function (item) {
						t.params.rotation.slider.setValue (item.get_rotation())
						t.params.rotation.input.value = item.get_rotation()
					},
					reset:	function() { t.params.rotation.slider.setValue (0); t.params.rotation.input.value = '' }
				}
			}

			this.params.rotation.reset()

			$H(this.params).each (function (pair) {
				pair.value.change.observe ('click', this.update_field_dependencies.bind (this));
				['change', 'keyup'].each (function (event_name) {
					pair.value.input['on' + event_name] = function (event) { t.field_updated (pair.key, pair.value.input) }
				})
			}.bind (this))

			this.reset()
		},

	field_updated:
		function (field_name, input)
		{
			this.selected_items.each (function (item) {
				if (field_name == 'rotation')
					item.set_rotation (input.value)
				else if (input.type == 'checkbox')
					item.data.struct[field_name] = input.checked
				else if (input.type == 'text' || input.type == 'password')
					item.data.struct[field_name] = input.value
				item.update()
			})
			this.surface.after_settings_changed()
		},

	reset:
		function()
		{
			$H(this.params).each (function (pair) {
				pair.value.change.checked = false
				pair.value.change.disabled = true
				pair.value.reset()
			})
			this.update_field_dependencies()
		},

	update_field_dependencies: 
		function()
		{
			$H(this.params).each (function (pair) {
				pair.value.input.disabled = !pair.value.change.checked
				pair.value.input.parentNode.parentNode.switchClassNames (pair.value.input.disabled, 'disabled', '')
			})
		},

	update:
		function()
		{
			this.selected_items = this.surface.find_items_with_tag ('selected')
			if (this.selected_items.length == 0)
				this.reset()
			else if (this.selected_items.length == 1)
				$H(this.params).each (function (pair) {
					pair.value.change.checked = true
					pair.value.change.disabled = true
					pair.value.update (this.selected_items[0])
				}.bind (this))
			else
				$H(this.params).each (function (pair) {
					var val = this.selected_items[0].data.struct[pair.key]
					var all = this.selected_items.all (function (item) { return item.data.struct[pair.key] == val })
					all ? pair.value.update (this.selected_items[0]) : pair.value.reset()
					pair.value.change.checked = all
					pair.value.change.disabled = false
				}.bind (this))
			this.update_field_dependencies()
		}
})


var Rooms = Class.create ({
	initialize:
		function()
		{
			this.list = []
			this.__refreshing = false
		},

	// Adds room or rooms (array) to list.
	add:
		function (room_or_array)
		{
			this.list = this.list.concat ([room_or_array].flatten())
		},

	// Returns Room object for given room_id.
	find_by_id:
		function (room_id)
		{
			return this.list.find (function (room) { return room.options.room_id == room_id })
		},

	// Initializes items for rooms using one request. Returns true if actual refresh has been
	// started, false otherwise.
	// \param	datetime - optional iso datetime string
	load:
		function (datetime)
		{
			if (this.__refreshing)
				return false
			this.__refreshing = true
			this.list.each (function (room) {
				if (room.options.tag_saver && !room.load_warning)
					room.tag_saver.save()
			})
			this.load_request_message = this.add_waiting_indicator()
			this.load_request = new Ajax.Request (URL.room_load_url, {
				method: 'get',
				parameters:
					{ rooms: this.list.collect (function (room) { return { room_id: room.options.room_id, area: true, items: true, reservation_items: true, event_id: room.options.event_id, reservation_id: room.options.reservation_id, datetime: datetime } }).toJSON() },
				onSuccess:
					function (transport) {
						all = transport.responseText.evalJSON (false)
						all.each (function (room_data) {
							var room = this.find_by_id (room_data.room_id)
							room.load_data (room_data)
							if (room.options.tag_saver && !room.load_warning)
								room.tag_saver.restore()
							room.after_load()
						}.bind (this))
						this.after_all_load()
					}.bind (this),
				onFailure:
					function (transport) {
						alert ("Komunikat serwera:\n\n" + transport.responseText)
					},
				onComplete:
					function (transport) {
						this.__refreshing = false
						this.load_request = null
						this.remove_waiting_indicator (this.load_request_message)
					}.bind (this)
			})
			return true
		},

	// Adds waiting indicator to all rooms.
	// Returns indicator ID.
	add_waiting_indicator:
		function()
		{
			var indicators = []
			this.list.each (function (room) { indicators.push (new Surface.WaitingIndicator (room)) })
			return indicators
		},

	// Removes waiting indicator from all rooms:
	remove_waiting_indicator:
		function (indicators_array)
		{
			indicators_array.each (function (indicator) { indicator.close() })
		},

	//
	// New callbacks
	//

	after_all_load:
		function() { }
})


var ReservationRoom = Class.create (Room, {
	initialize:
		function ($super, element, options, rooms)
		{
			$super (element, options)
			// Link to rooms array:
			this.rooms = rooms
		},

	create_item_object:
		function (item_data)
		{
			// Creates item:
			return new ReservationRoom.Item (this, item_data)
		},

	load_data:
		function ($super, room_data)
		{
			$super (room_data)
			if (room_data.items instanceof Array)
			{
				// Select items (and tickets):
				if (room_data.reservation_items)
				{
					room_data.reservation_items.each (function (reservation_item) {
						// reservation_item { id, item_id, ticket: { id: … }, reservation_id }
						var item = this.items.find (function (item) { return item.data.struct.id == reservation_item.item_id })
						item.selected_ticket = reservation_item.ticket
						item.set_tag ('selected', true)
					}.bind (this))
				}
			}
		}
})


ReservationRoom.Item = Class.create (Room.Item, {
	before_tag:
		function (tag, set)
		{
			// Only reservable and free items are selectable:
			if (set && tag == 'selected')
				return this.data.struct.reservable && this.data.free
		},

	after_tag:
		function ($super, tag, set)
		{
			$super (tag, set)
			// Update summary table:
			if (tag == 'selected' && (!this.is_ticketed() || !set))
				this.surface.rooms.update_summary()
			// Add remove triangular indicator on tab heading:
			$('room-tab-heading-' + this.surface.options.room_id).switchClassNames (this.surface.find_items_with_tag ('selected').length > 0, 'highlight')
// TODO		(item.selected && !item.data.free)? item.warn() : item.unwarn()
		},

	after_ticket_selection:
		function()
		{
			// Update summary table:
			this.surface.rooms.update_summary()
		},

	before_tag:
		function ($super, tag, set)
		{
			var s = $super (tag, set)
			if (typeof s === 'undefined' || s === null)
				s = true
			return s && this.data.struct.reservable
		},

	before_hover:
		function()
		{
			// Only reservable and free items are hoverable:
			return this.data.struct.reservable && this.data.free
		}
})


UserReservationRoom = Class.create (ReservationRoom, {
	initialize:
		function ($super, element, options, rooms)
		{
			$super (element, Object.extend (options, { show_baloons: true }), rooms)
		},

	create_item_object:
		function (item_data)
		{
			return new UserReservationRoom.Item (this, item_data)
		}
})


UserReservationRoom.Item = Class.create (ReservationRoom.Item, {
	before_tag:
		function ($super, tag, set)
		{
			var s = $super (tag, set)
			if (typeof s === 'undefined' || s === null)
				s = true
			return s && !this.data.reserved
		}
})


AdminReservationRoom = Class.create (ReservationRoom, {
	initialize:
		function ($super, element, options, rooms)
		{
			$super (element, Object.extend (options, { show_baloons: true }), rooms)
		},

	create_item_object:
		function (item_data)
		{
			return new AdminReservationRoom.Item (this, item_data)
		}
})


AdminReservationRoom.Item = Class.create (ReservationRoom.Item, {
})


var ReservationRooms = Class.create (Rooms, {
	initialize:
		function ($super, RoomClass, room_ids, event_id, reservation_id, summary_element)
		{
			$super()

			this.initialized = false
			this.summary = new ReservationSummaryTable (summary_element)

			room_ids.each (function (room_id) {
				var room = new RoomClass ('surface-' + room_id, {
					allow_moving:   false,
					selections:     { box: false, click: true, bg_unselect: false, multiselect: true },
					tag_saver:      true,
					room_id:        room_id,
					event_id:       event_id,
					reservation_id: reservation_id
				}, this)
				this.add (room)
				$('room-tab-' + room_id).on_tab_select = function() { rooms.initialized && room.enable() }
				$('room-tab-' + room_id).on_tab_unselect = function() { rooms.initialized && room.disable() }
			}.bind (this))
		},

	set_datetime:
		function (datetime)
		{
			if (datetime != this.datetime)
				rooms.load (datetime)
		},

	load:
		function ($super, datetime)
		{
			// Clear summary. It will be refilled when TagSaver restores
			// tags on items after load.
			this.summary.clear()
			this.datetime = datetime
			$super (datetime)
		},

	update_summary:
		function()
		{
			if (this.update_summary_timeout)
			{
				clearTimeout (this.update_summary_timeout)
				this.update_summary_timeout = null
			}
			this.summary.clear()
			this.list.inject ([], function (mem, room) { return mem.concat (room.find_items_with_tag ('selected')) }).each (function (item) { this.summary.add_item (item, true) }.bind (this))
			this.summary.changed()
		},

	after_all_load:
		function ($super)
		{
			$super()
			this.initialized = true
			this.summary.loaded()
		}
})


var AdminReservationRooms = Class.create (ReservationRooms, {
	initialize:
		function ($super, room_ids, event_id, reservation_id, summary_element)
		{
			$super (AdminReservationRoom, room_ids, event_id, reservation_id, summary_element)

			this.summary.observe ('after_change', this.__summary_after_change.bind (this))

			// this.reservation_summary_button is set externally
		},

	after_all_load:
		function ($super)
		{
			$super()
			// Select first tab with selected items:
			var room_id = this.list.find (function (room) {
				return room.find_items_with_tag ('selected').length > 0
			}).options.room_id
			$('room-tab-heading-' + room_id).tabber_select()
			if (!this.initialized)
				$('reservation-summary-af').removeClassName ('changed')
		},

	__summary_after_change:
		function()
		{
			if (this.reservation_summary_button && this.initialized)
			{
				$('reservation-summary-af').addClassName ('changed')
				this.reservation_summary_button.set_ready()
			}
			// TODO ostrzeganie, jeśli nie ma żadnych miejsc w rezerwacji (na czerwono + komunikat)
			// TODO ostrzeganie, jeśli rez. na event i jest kolizja + komunikat:
			//if (this.list[0].options.event_id)
			//	$('reservation-summary-af').switchClassNames (this.list.any (function (room) { return room.get_warned_items().length > 0 }), 'warning')
		}
})


var UserReservationRooms = Class.create (ReservationRooms, {
	initialize:
		function ($super, room_ids, event_id, reservation_id, summary_element)
		{
			$super (UserReservationRoom, room_ids, event_id, reservation_id, summary_element)

			this.summary_baloon = $('reservation-baloon')
			this.summary_baloon && this.summary_baloon.hide()

			this.summary.observe ('after_open', this.__summary_after_open.bind (this))
			this.summary.observe ('after_close', this.__summary_after_close.bind (this))
			this.summary.observe ('after_change', this.__summary_after_change.bind (this))

			this.reserve_button = $('reserve-button')

			this.cancel_button = $('cancel-reservation-button')
			this.cancel_button.observe ('click', this.__cancel_reservation.bind (this))
		},

	__summary_after_open:
		function()
		{
			this.reserve_button.disabled = false
			this.summary_baloon && this.summary_baloon.appear ({ duration: 0.25 })
		},

	__summary_after_close:
		function()
		{
			this.reserve_button.disabled = true
		},

	__summary_after_change:
		function()
		{
			this.reserve_button.disabled = this.summary.items_count() == 0
		},

	__cancel_reservation:
		function()
		{
			this.list.each (function (room) { room.find_items_with_tag ('selected').invoke ('set_tag', 'selected', false) })
			this.summary.clear()
			this.summary_baloon && this.summary_baloon.fade ({ duration: 0.25 })
		}
})


var AsyncButton = Class.create ({
	initialize:
		function (element, async_field_element)
		{
			this.element = $(element)
			this.ready_text = 'Aktualizuj'
			this.waiting_text = 'Chwileczkę…'
			this.done_text = 'Zaktualizowano'
			this.disabled = true
			this.element.update (this.ready_text)
			this.async_field_element = $(async_field_element)
			Object.extend (this.element, this)
		},

	set_ready:
		function()
		{
			this.disabled = false
			this.element.update (this.ready_text)
			if (this.async_field_element)
				this.async_field_element.addClassName ('changed')
		},

	set_waiting:
		function()
		{
			this.disabled = true
			this.element.update (this.waiting_text)
		},

	set_done:
		function()
		{
			this.disabled = true
			this.element.update (this.done_text)
			if (this.async_field_element)
				this.async_field_element.removeClassName ('changed')
		}
})


var Reservation = Class.create ({
	initialize:
		function (reservation_id)
		{
			this.reservation_id = reservation_id
		},

	setup_field:
		function (method_name, input, button, async_field_element, after_lambda)
		{
			input = $(input)
			button = (new AsyncButton (button, async_field_element)).element
			input.observe ('change', function() { button.set_ready() })
			input.observe ('keydown', function() { button.set_ready() })
			button.observe ('click', function() { this[method_name](input.value, button, after_lambda) }.bind (this))
		},

	update_state:
		function (state, button, after_lambda)
		{
			this.update_generic_value (AsyncButtonConf.update_state_url, { state: state }, button)
			if (after_lambda)
				after_lambda()
		},

	update_admin_comment:
		function (comment, button)
		{
			this.update_generic_value (AsyncButtonConf.update_admin_comment_url, { admin_comment: comment }, button)
		},

	update_user_comment:
		function (comment, button)
		{
			this.update_generic_value (AsyncButtonConf.update_user_comment_url, { user_comment: comment }, button)
		},

	update_generic_value:
		function (url, parameters, button)
		{
			button.set_waiting()
			new Ajax.Request (url, {
				method: 'post',
				parameters: Object.extend ({ authenticity_token: window.authenticity_token, reservation_id: this.reservation_id }, parameters),
				onSuccess: function (transport) { button.set_done() },
				onFailure: function (transport) {
					alert (transport.responseText)
					button.set_ready()
				}
			})
		}
})


ReservationSummaryTable = Class.create ({
	initialize:
		function (element)
		{
			this.element = $(element)
			this.element.addClassName ('reservation-summary')
			this.items = {}
			this.is_loaded = false
			this.update()
			this.observers_disabled = false
			this.observers = { after_change: [], after_open: [], after_close: [] }
		},

	observe:
		function (event_types, callback)
		{
			event_types = [event_types].flatten()
			event_types.each (function (v) { this.observers[v].push (callback) }.bind (this))
		},

	loaded:
		function()
		{
			this.is_loaded = true
			this.update()
		},

	add_item:
		function (item, skip_after_change)
		{
			if (item.is_ticketed())
			{
				if (item.selected_ticket !== null && !this.items[item.data.struct.id])
					this.items[item.data.struct.id] = { item: item, ticket: item.selected_ticket }
			}
			else
			{
				if (!this.items[item.data.struct.id])
					this.items[item.data.struct.id] = { item: item }
			}
			this.update()
			if (!this.observers_disabled)
			{
				skip_after_change || this.observers.after_change.each (function (o) { o() })
				if ($H(this.items).keys().length == 1)
					this.observers.after_open.each (function (o) { o() })
			}
		},

	remove_item:
		function (item, skip_after_change)
		{
			delete this.items[item.data.struct.id]
			this.update()
			if (!this.observers_disabled)
			{
				skip_after_change || this.observers.after_change.each (function (o) { o() })
				if ($H(this.items).keys().length == 0)
					this.observers.after_close.each (function (o) { o() })
			}
		},

	clear:
		function()
		{
			this.items = {}
			this.update()
			this.observers.after_change.each (function (o) { o() })
		},

	items_count:
		function()
		{
			return $H(this.items).keys().length;
		},

	changed:
		function()
		{
			this.observers.after_change.each (function (o) { o() })
		},

	update:
		function()
		{
			if (!this.is_loaded)
			{
				this.element.update ('<h3>Chwileczkę…</h3>')
				return
			}

			Infopedia.DOM.removeChildren (this.element)

			if ($H(this.items).keys().length == 0)
			{
				var h = new Element ('h3')
				h.update ('Nie wybrano miejsc')
				this.element.appendChild (h)
			}
			else
			{
				var price = 0
				var grouped_tickets = {}
				var rooms = {}
				var price = $H(this.items).keys().inject (0, function (mem, k) { return mem + this.items[k].item.data.struct.reservation_price }.bind (this))
				var total_price = $H(this.items).keys().inject (price, function (mem, k) { return mem + (this.items[k].ticket? this.items[k].ticket.price : 0) }.bind (this))

				var tickets = {}
				$H(this.items).each (function (pair) {
					if (pair.value.ticket && !tickets[pair.value.ticket.id])
						tickets[pair.value.ticket.id] = pair.value.ticket
				})

				$H(this.items).each (function (pair) {
					var item = pair.value.item
					var ticket = pair.value.ticket
					rooms[item.data.room.name] = rooms[item.data.room.name]? rooms[item.data.room.name] + 1 : 1
					if (ticket)
						grouped_tickets[ticket.id] = grouped_tickets[ticket.id]? grouped_tickets[ticket.id] + 1 : 1
				}.bind (this))

				// Header:
				var h = new Element ('h3')
				h.update ("Wybrane miejsca: #{count}".interpolate ({ count: $H(this.items).keys().length }) + (price? " — #{price} zł".interpolate ({ price: price }) : ""))
				this.element.appendChild (h)

				// Selected items per room:
				var ul = new Element ('ul')
				$H(rooms).each (function (pair) {
					var li = new Element ('li')
					li.update ("#{room}, #{count} miejsc(a)".interpolate ({ room: pair.key, count: pair.value }))
					ul.appendChild (li)
				})
				this.element.appendChild (ul)

				// Selected tickets:
				if ($H(grouped_tickets).keys().length > 0)
				{
					h = new Element ('h3')
					h.update ('Bilety:')
					this.element.appendChild (h)

					var ul = new Element ('ul')
					$H(grouped_tickets).each (function (pair) {
						var ticket_id = pair.key
						var li = new Element ('li')
						li.update ("#{name} — #{count} × #{price} zł".interpolate ({ name: tickets[ticket_id].category_name, count: grouped_tickets[ticket_id], price: tickets[ticket_id].price }))
						ul.appendChild (li)
					}.bind (this))
					this.element.appendChild (ul)
				}

				// Total price:
				var price_p = new Element ('p', { style: 'font-size: 120%' })
				price_p.update ("Cena całkowita: <b>#{total_price} zł</b>".interpolate ({ total_price: (total_price * 100).round() / 100 }))
				this.element.appendChild (price_p)

				// Hidden inputs:
				var div = new Element ('div')
				$H(this.items).each (function (pair) {
					var item = pair.value.item
					var ticket = pair.value.ticket
					var input = new Element ('input', { type: 'hidden', name: 'reservation[item_ids][]', value: item.data.struct.id })
					div.appendChild (input)
					if (ticket)
					{
						var input = new Element ('input', { type: 'hidden', name: 'reservation[ticket_ids][#{item_id}]'.interpolate ({ item_id: item.data.struct.id }), value: ticket.id })
						div.appendChild (input)
					}
				}.bind (this))
				this.element.appendChild (div)
			}
		}
})