/*  Prototype JavaScript framework, version 1.5.0

 *  (c) 2005-2007 Sam Stephenson

 *

 *  Prototype is freely distributable under the terms of an MIT-style license.

 *  For details, see the Prototype web site: http://prototype.conio.net/

 *

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



var Prototype = {

  Version: '1.5.0',

  BrowserFeatures: {

    XPath: !!document.evaluate

  },



  ScriptFragment: '(?:<script.*?>)((\n|\r|.)*?)(?:<\/script>)',

  emptyFunction: function() {},

  K: function(x) { return x }

}



var Class = {

  create: function() {

    return function() {

      this.initialize.apply(this, arguments);

    }

  }

}



var Abstract = new Object();



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 === undefined) return 'undefined';

      if (object === null) return 'null';

      return object.inspect ? object.inspect() : object.toString();

    } catch (e) {

      if (e instanceof RangeError) return '...';

      throw e;

    }

  },



  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);

  }

});



Function.prototype.bind = function() {

  var __method = this, args = $A(arguments), object = args.shift();

  return function() {

    return __method.apply(object, args.concat($A(arguments)));

  }

}



Function.prototype.bindAsEventListener = function(object) {

  var __method = this, args = $A(arguments), object = args.shift();

  return function(event) {

    return __method.apply(object, [( event || window.event)].concat(args).concat($A(arguments)));

  }

}



Object.extend(Number.prototype, {

  toColorPart: function() {

    var digits = this.toString(16);

    if (this < 16) return '0' + digits;

    return digits;

  },



  succ: function() {

    return this + 1;

  },



  times: function(iterator) {

    $R(0, this, true).each(iterator);

    return this;

  }

});



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;

  }

}



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



var PeriodicalExecuter = Class.create();

PeriodicalExecuter.prototype = {

  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);

  },



  stop: function() {

    if (!this.timer) return;

    clearInterval(this.timer);

    this.timer = null;

  },



  onTimerEvent: function() {

    if (!this.currentlyExecuting) {

      try {

        this.currentlyExecuting = true;

        this.callback(this);

      } finally {

        this.currentlyExecuting = false;

      }

    }

  }

}

String.interpret = function(value){

  return value == null ? '' : String(value);

}



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 = count === undefined ? 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 this;

  },



  truncate: function(length, truncation) {

    length = length || 30;

    truncation = truncation === undefined ? '...' : truncation;

    return this.length > length ?

      this.slice(0, length - truncation.length) + truncation : 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 div = document.createElement('div');

    var text = document.createTextNode(this);

    div.appendChild(text);

    return div.innerHTML;

  },



  unescapeHTML: function() {

    var div = document.createElement('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 name = decodeURIComponent(pair[0]);

        var value = pair[1] ? decodeURIComponent(pair[1]) : undefined;



        if (hash[name] !== undefined) {

          if (hash[name].constructor != Array)

            hash[name] = [hash[name]];

          if (value) hash[name].push(value);

        }

        else hash[name] = 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);

  },



  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.replace(/\\/g, '\\\\');

    if (useDoubleQuotes)

      return '"' + escapedString.replace(/"/g, '\\"') + '"';

    else

      return "'" + escapedString.replace(/'/g, '\\\'') + "'";

  }

});



String.prototype.gsub.prepareReplacement = function(replacement) {

  if (typeof replacement == 'function') return replacement;

  var template = new Template(replacement);

  return function(match) { return template.evaluate(match) };

}



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



var Template = Class.create();

Template.Pattern = /(^|.|\r|\n)(#\{(.*?)\})/;

Template.prototype = {

  initialize: function(template, pattern) {

    this.template = template.toString();

    this.pattern  = pattern || Template.Pattern;

  },



  evaluate: function(object) {

    return this.template.gsub(this.pattern, function(match) {

      var before = match[1];

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

      return before + String.interpret(object[match[3]]);

    });

  }

}



var $break    = new Object();

var $continue = new Object();



var Enumerable = {

  each: function(iterator) {

    var index = 0;

    try {

      this._each(function(value) {

        try {

          iterator(value, index++);

        } catch (e) {

          if (e != $continue) throw e;

        }

      });

    } catch (e) {

      if (e != $break) throw e;

    }

    return this;

  },



  eachSlice: function(number, iterator) {

    var index = -number, slices = [], array = this.toArray();

    while ((index += number) < array.length)

      slices.push(array.slice(index, index+number));

    return slices.map(iterator);

  },



  all: function(iterator) {

    var result = true;

    this.each(function(value, index) {

      result = result && !!(iterator || Prototype.K)(value, index);

      if (!result) throw $break;

    });

    return result;

  },



  any: function(iterator) {

    var result = false;

    this.each(function(value, index) {

      if (result = !!(iterator || Prototype.K)(value, index))

        throw $break;

    });

    return result;

  },



  collect: function(iterator) {

    var results = [];

    this.each(function(value, index) {

      results.push((iterator || Prototype.K)(value, index));

    });

    return results;

  },



  detect: function(iterator) {

    var result;

    this.each(function(value, index) {

      if (iterator(value, index)) {

        result = value;

        throw $break;

      }

    });

    return result;

  },



  findAll: function(iterator) {

    var results = [];

    this.each(function(value, index) {

      if (iterator(value, index))

        results.push(value);

    });

    return results;

  },



  grep: function(pattern, iterator) {

    var results = [];

    this.each(function(value, index) {

      var stringValue = value.toString();

      if (stringValue.match(pattern))

        results.push((iterator || Prototype.K)(value, index));

    })

    return results;

  },



  include: function(object) {

    var found = false;

    this.each(function(value) {

      if (value == object) {

        found = true;

        throw $break;

      }

    });

    return found;

  },



  inGroupsOf: function(number, fillWith) {

    fillWith = fillWith === undefined ? null : fillWith;

    return this.eachSlice(number, function(slice) {

      while(slice.length < number) slice.push(fillWith);

      return slice;

    });

  },



  inject: function(memo, iterator) {

    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) {

    var result;

    this.each(function(value, index) {

      value = (iterator || Prototype.K)(value, index);

      if (result == undefined || value >= result)

        result = value;

    });

    return result;

  },



  min: function(iterator) {

    var result;

    this.each(function(value, index) {

      value = (iterator || Prototype.K)(value, index);

      if (result == undefined || value < result)

        result = value;

    });

    return result;

  },



  partition: function(iterator) {

    var trues = [], falses = [];

    this.each(function(value, index) {

      ((iterator || Prototype.K)(value, index) ?

        trues : falses).push(value);

    });

    return [trues, falses];

  },



  pluck: function(property) {

    var results = [];

    this.each(function(value, index) {

      results.push(value[property]);

    });

    return results;

  },



  reject: function(iterator) {

    var results = [];

    this.each(function(value, index) {

      if (!iterator(value, index))

        results.push(value);

    });

    return results;

  },



  sortBy: function(iterator) {

    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 (typeof args.last() == 'function')

      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,

  member:  Enumerable.include,

  entries: Enumerable.toArray

});

var $A = Array.from = function(iterable) {

  if (!iterable) return [];

  if (iterable.toArray) {

    return iterable.toArray();

  } else {

    var results = [];

    for (var i = 0, length = iterable.length; i < length; i++)

      results.push(iterable[i]);

    return results;

  }

}



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(value && value.constructor == Array ?

        value.flatten() : [value]);

    });

  },



  without: function() {

    var values = $A(arguments);

    return this.select(function(value) {

      return !values.include(value);

    });

  },



  indexOf: function(object) {

    for (var i = 0, length = this.length; i < length; i++)

      if (this[i] == object) return i;

    return -1;

  },



  reverse: function(inline) {

    return (inline !== false ? this : this.toArray())._reverse();

  },



  reduce: function() {

    return this.length > 1 ? this : this[0];

  },



  uniq: function() {

    return this.inject([], function(array, value) {

      return array.include(value) ? array : array.concat([value]);

    });

  },



  clone: function() {

    return [].concat(this);

  },



  size: function() {

    return this.length;

  },



  inspect: function() {

    return '[' + this.map(Object.inspect).join(', ') + ']';

  }

});



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



function $w(string){

  string = string.strip();

  return string ? string.split(/\s+/) : [];

}



if(window.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(arguments[i].constructor == Array) {

        for(var j = 0, arrayLength = arguments[i].length; j < arrayLength; j++)

          array.push(arguments[i][j]);

      } else {

        array.push(arguments[i]);

      }

    }

    return array;

  }

}

var Hash = function(obj) {

  Object.extend(this, obj || {});

};



Object.extend(Hash, {

  toQueryString: function(obj) {

    var parts = [];



	  this.prototype._each.call(obj, function(pair) {

      if (!pair.key) return;



      if (pair.value && pair.value.constructor == Array) {

        var values = pair.value.compact();

        if (values.length < 2) pair.value = values.reduce();

        else {

        	key = encodeURIComponent(pair.key);

          values.each(function(value) {

            value = value != undefined ? encodeURIComponent(value) : '';

            parts.push(key + '=' + encodeURIComponent(value));

          });

          return;

        }

      }

      if (pair.value == undefined) pair[1] = '';

      parts.push(pair.map(encodeURIComponent).join('='));

	  });



    return parts.join('&');

  }

});



Object.extend(Hash.prototype, Enumerable);

Object.extend(Hash.prototype, {

  _each: function(iterator) {

    for (var key in this) {

      var value = this[key];

      if (value && value == Hash.prototype[key]) continue;



      var pair = [key, value];

      pair.key = key;

      pair.value = value;

      iterator(pair);

    }

  },



  keys: function() {

    return this.pluck('key');

  },



  values: function() {

    return this.pluck('value');

  },



  merge: function(hash) {

    return $H(hash).inject(this, function(mergedHash, pair) {

      mergedHash[pair.key] = pair.value;

      return mergedHash;

    });

  },



  remove: function() {

    var result;

    for(var i = 0, length = arguments.length; i < length; i++) {

      var value = this[arguments[i]];

      if (value !== undefined){

        if (result === undefined) result = value;

        else {

          if (result.constructor != Array) result = [result];

          result.push(value)

        }

      }

      delete this[arguments[i]];

    }

    return result;

  },



  toQueryString: function() {

    return Hash.toQueryString(this);

  },



  inspect: function() {

    return '#<Hash:{' + this.map(function(pair) {

      return pair.map(Object.inspect).join(': ');

    }).join(', ') + '}>';

  }

});



function $H(object) {

  if (object && object.constructor == Hash) return object;

  return new Hash(object);

};

ObjectRange = Class.create();

Object.extend(ObjectRange.prototype, Enumerable);

Object.extend(ObjectRange.prototype, {

  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 (typeof responder[callback] == 'function') {

        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 = function() {};

Ajax.Base.prototype = {

  setOptions: function(options) {

    this.options = {

      method:       'post',

      asynchronous: true,

      contentType:  'application/x-www-form-urlencoded',

      encoding:     'UTF-8',

      parameters:   ''

    }

    Object.extend(this.options, options || {});



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

    if (typeof this.options.parameters == 'string')

      this.options.parameters = this.options.parameters.toQueryParams();

  }

}



Ajax.Request = Class.create();

Ajax.Request.Events =

  ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];



Ajax.Request.prototype = Object.extend(new Ajax.Base(), {

  _complete: false,



  initialize: function(url, options) {

    this.transport = Ajax.getTransport();

    this.setOptions(options);

    this.request(url);

  },



  request: function(url) {

    this.url = url;

    this.method = this.options.method;

    var params = this.options.parameters;



    if (!['get', 'post'].include(this.method)) {

      // simulate other verbs over post

      params['_method'] = this.method;

      this.method = 'post';

    }



    params = Hash.toQueryString(params);

    if (params && /Konqueror|Safari|KHTML/.test(navigator.userAgent)) params += '&_='



    // when GET, append parameters to URL

    if (this.method == 'get' && params)

      this.url += (this.url.indexOf('?') > -1 ? '&' : '?') + params;



    try {

      Ajax.Responders.dispatch('onCreate', this, this.transport);



      this.transport.open(this.method.toUpperCase(), this.url,

        this.options.asynchronous);



      if (this.options.asynchronous)

        setTimeout(function() { this.respondToReadyState(1) }.bind(this), 10);



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

      this.setRequestHeaders();



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



      this.transport.send(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 (typeof extras.push == 'function')

        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() {

    return !this.transport.status

        || (this.transport.status >= 200 && this.transport.status < 300);

  },



  respondToReadyState: function(readyState) {

    var state = Ajax.Request.Events[readyState];

    var transport = this.transport, json = this.evalJSON();



    if (state == 'Complete') {

      try {

        this._complete = true;

        (this.options['on' + this.transport.status]

         || this.options['on' + (this.success() ? 'Success' : 'Failure')]

         || Prototype.emptyFunction)(transport, json);

      } catch (e) {

        this.dispatchException(e);

      }



      if ((this.getHeader('Content-type') || 'text/javascript').strip().

        match(/^(text|application)\/(x-)?(java|ecma)script(;.*)?$/i))

          this.evalResponse();

    }



    try {

      (this.options['on' + state] || Prototype.emptyFunction)(transport, json);

      Ajax.Responders.dispatch('on' + state, this, transport, json);

    } catch (e) {

      this.dispatchException(e);

    }



    if (state == 'Complete') {

      // avoid memory leak in MSIE: clean up

      this.transport.onreadystatechange = Prototype.emptyFunction;

    }

  },



  getHeader: function(name) {

    try {

      return this.transport.getResponseHeader(name);

    } catch (e) { return null }

  },



  evalJSON: function() {

    try {

      var json = this.getHeader('X-JSON');

      return json ? eval('(' + json + ')') : null;

    } catch (e) { return null }

  },



  evalResponse: function() {

    try {

      return eval(this.transport.responseText);

    } catch (e) {

      this.dispatchException(e);

    }

  },



  dispatchException: function(exception) {

    (this.options.onException || Prototype.emptyFunction)(this, exception);

    Ajax.Responders.dispatch('onException', this, exception);

  }

});



Ajax.Updater = Class.create();



Object.extend(Object.extend(Ajax.Updater.prototype, Ajax.Request.prototype), {

  initialize: function(container, url, options) {

    this.container = {

      success: (container.success || container),

      failure: (container.failure || (container.success ? null : container))

    }



    this.transport = Ajax.getTransport();

    this.setOptions(options);



    var onComplete = this.options.onComplete || Prototype.emptyFunction;

    this.options.onComplete = (function(transport, param) {

      this.updateContent();

      onComplete(transport, param);

    }).bind(this);



    this.request(url);

  },



  updateContent: function() {

    var receiver = this.container[this.success() ? 'success' : 'failure'];

    var response = this.transport.responseText;



    if (!this.options.evalScripts) response = response.stripScripts();



    if (receiver = $(receiver)) {

      if (this.options.insertion)

        new this.options.insertion(receiver, response);

      else

        receiver.update(response);

    }



    if (this.success()) {

      if (this.onComplete)

        setTimeout(this.onComplete.bind(this), 10);

    }

  }

});



Ajax.PeriodicalUpdater = Class.create();

Ajax.PeriodicalUpdater.prototype = Object.extend(new Ajax.Base(), {

  initialize: function(container, url, options) {

    this.setOptions(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(request) {

    if (this.options.decay) {

      this.decay = (request.responseText == this.lastText ?

        this.decay * this.options.decay : 1);



      this.lastText = request.responseText;

    }

    this.timer = setTimeout(this.onTimerEvent.bind(this),

      this.decay * this.frequency * 1000);

  },



  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 (typeof element == 'string')

    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(query.snapshotItem(i));

    return results;

  };

}



document.getElementsByClassName = function(className, parentElement) {

  if (Prototype.BrowserFeatures.XPath) {

    var q = ".//*[contains(concat(' ', @class, ' '), ' " + className + " ')]";

    return document._getElementsByXPath(q, parentElement);

  } else {

    var children = ($(parentElement) || document.body).getElementsByTagName('*');

    var elements = [], child;

    for (var i = 0, length = children.length; i < length; i++) {

      child = children[i];

      if (Element.hasClassName(child, className))

        elements.push(Element.extend(child));

    }

    return elements;

  }

};



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



if (!window.Element)

  var Element = new Object();



Element.extend = function(element) {

  if (!element || _nativeExtensions || element.nodeType == 3) return element;



  if (!element._extended && element.tagName && element != window) {

    var methods = Object.clone(Element.Methods), cache = Element.extend.cache;



    if (element.tagName == 'FORM')

      Object.extend(methods, Form.Methods);

    if (['INPUT', 'TEXTAREA', 'SELECT'].include(element.tagName))

      Object.extend(methods, Form.Element.Methods);



    Object.extend(methods, Element.Methods.Simulated);



    for (var property in methods) {

      var value = methods[property];

      if (typeof value == 'function' && !(property in element))

        element[property] = cache.findOrStore(value);

    }

  }



  element._extended = true;

  return element;

};



Element.extend.cache = {

  findOrStore: function(value) {

    return this[value] = this[value] || function() {

      return value.apply(null, [this].concat($A(arguments)));

    }

  }

};



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, html) {

    html = typeof html == 'undefined' ? '' : html.toString();

    $(element).innerHTML = html.stripScripts();

    setTimeout(function() {html.evalScripts()}, 10);

    return element;

  },



  replace: function(element, html) {

    element = $(element);

    html = typeof html == 'undefined' ? '' : html.toString();

    if (element.outerHTML) {

      element.outerHTML = html.stripScripts();

    } else {

      var range = element.ownerDocument.createRange();

      range.selectNodeContents(element);

      element.parentNode.replaceChild(

        range.createContextualFragment(html.stripScripts()), element);

    }

    setTimeout(function() {html.evalScripts()}, 10);

    return element;

  },



  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 $A($(element).getElementsByTagName('*'));

  },



  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 (typeof selector == 'string')

      selector = new Selector(selector);

    return selector.match($(element));

  },



  up: function(element, expression, index) {

    return Selector.findElement($(element).ancestors(), expression, index);

  },



  down: function(element, expression, index) {

    return Selector.findElement($(element).descendants(), expression, index);

  },



  previous: function(element, expression, index) {

    return Selector.findElement($(element).previousSiblings(), expression, index);

  },



  next: function(element, expression, index) {

    return Selector.findElement($(element).nextSiblings(), expression, index);

  },



  getElementsBySelector: function() {

    var args = $A(arguments), element = $(args.shift());

    return Selector.findChildElements(element, args);

  },



  getElementsByClassName: function(element, className) {

    return document.getElementsByClassName(className, element);

  },



  readAttribute: function(element, name) {

    element = $(element);

    if (document.all && !window.opera) {

      var t = Element._attributeTranslations;

      if (t.values[name]) return t.values[name](element, name);

      if (t.names[name])  name = t.names[name];

      var attribute = element.attributes[name];

      if(attribute) return attribute.nodeValue;

    }

    return element.getAttribute(name);

  },



  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;

    if (elementClassName.length == 0) return false;

    if (elementClassName == className ||

        elementClassName.match(new RegExp("(^|\\s)" + className + "(\\s|$)")))

      return true;

    return false;

  },



  addClassName: function(element, className) {

    if (!(element = $(element))) return;

    Element.classNames(element).add(className);

    return element;

  },



  removeClassName: function(element, className) {

    if (!(element = $(element))) return;

    Element.classNames(element).remove(className);

    return element;

  },



  toggleClassName: function(element, className) {

    if (!(element = $(element))) return;

    Element.classNames(element)[element.hasClassName(className) ? 'remove' : 'add'](className);

    return element;

  },



  observe: function() {

    Event.observe.apply(Event, arguments);

    return $A(arguments).first();

  },



  stopObserving: function() {

    Event.stopObserving.apply(Event, arguments);

    return $A(arguments).first();

  },



  // 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 $(element).innerHTML.match(/^\s*$/);

  },



  descendantOf: function(element, ancestor) {

    element = $(element), ancestor = $(ancestor);

    while (element = element.parentNode)

      if (element == ancestor) return true;

    return false;

  },



  scrollTo: function(element) {

    element = $(element);

    var pos = Position.cumulativeOffset(element);

    window.scrollTo(pos[0], pos[1]);

    return element;

  },



  getStyle: function(element, style) {

    element = $(element);

    if (['float','cssFloat'].include(style))

      style = (typeof element.style.styleFloat != 'undefined' ? 'styleFloat' : 'cssFloat');

    style = style.camelize();

    var value = element.style[style];

    if (!value) {

      if (document.defaultView && document.defaultView.getComputedStyle) {

        var css = document.defaultView.getComputedStyle(element, null);

        value = css ? css[style] : null;

      } else if (element.currentStyle) {

        value = element.currentStyle[style];

      }

    }



    if((value == 'auto') && ['width','height'].include(style) && (element.getStyle('display') != 'none'))

      value = element['offset'+style.capitalize()] + 'px';



    if (window.opera && ['left', 'top', 'right', 'bottom'].include(style))

      if (Element.getStyle(element, 'position') == 'static') value = 'auto';

    if(style == 'opacity') {

      if(value) return parseFloat(value);

      if(value = (element.getStyle('filter') || '').match(/alpha\(opacity=(.*)\)/))

        if(value[1]) return parseFloat(value[1]) / 100;

      return 1.0;

    }

    return value == 'auto' ? null : value;

  },



  setStyle: function(element, style) {

    element = $(element);

    for (var name in style) {

      var value = style[name];

      if(name == 'opacity') {

        if (value == 1) {

          value = (/Gecko/.test(navigator.userAgent) &&

            !/Konqueror|Safari|KHTML/.test(navigator.userAgent)) ? 0.999999 : 1.0;

          if(/MSIE/.test(navigator.userAgent) && !window.opera)

            element.style.filter = element.getStyle('filter').replace(/alpha\([^\)]*\)/gi,'');

        } else if(value == '') {

          if(/MSIE/.test(navigator.userAgent) && !window.opera)

            element.style.filter = element.getStyle('filter').replace(/alpha\([^\)]*\)/gi,'');

        } else {

          if(value < 0.00001) value = 0;

          if(/MSIE/.test(navigator.userAgent) && !window.opera)

            element.style.filter = element.getStyle('filter').replace(/alpha\([^\)]*\)/gi,'') +

              'alpha(opacity='+value*100+')';

        }

      } else if(['float','cssFloat'].include(name)) name = (typeof element.style.styleFloat != 'undefined') ? 'styleFloat' : 'cssFloat';

      element.style[name.camelize()] = 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.style.overflow || 'auto';

    if ((Element.getStyle(element, 'overflow') || 'visible') != '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;

  }

};



Object.extend(Element.Methods, {childOf: Element.Methods.descendantOf});



Element._attributeTranslations = {};



Element._attributeTranslations.names = {

  colspan:   "colSpan",

  rowspan:   "rowSpan",

  valign:    "vAlign",

  datetime:  "dateTime",

  accesskey: "accessKey",

  tabindex:  "tabIndex",

  enctype:   "encType",

  maxlength: "maxLength",

  readonly:  "readOnly",

  longdesc:  "longDesc"

};



Element._attributeTranslations.values = {

  _getAttr: function(element, attribute) {

    return element.getAttribute(attribute, 2);

  },



  _flag: function(element, attribute) {

    return $(element).hasAttribute(attribute) ? attribute : null;

  },



  style: function(element) {

    return element.style.cssText.toLowerCase();

  },



  title: function(element) {

    var node = element.getAttributeNode('title');

    return node.specified ? node.nodeValue : null;

  }

};



Object.extend(Element._attributeTranslations.values, {

  href: Element._attributeTranslations.values._getAttr,

  src:  Element._attributeTranslations.values._getAttr,

  disabled: Element._attributeTranslations.values._flag,

  checked:  Element._attributeTranslations.values._flag,

  readonly: Element._attributeTranslations.values._flag,

  multiple: Element._attributeTranslations.values._flag

});



Element.Methods.Simulated = {

  hasAttribute: function(element, attribute) {

    var t = Element._attributeTranslations;

    attribute = t.names[attribute] || attribute;

    return $(element).getAttributeNode(attribute).specified;

  }

};



// IE is missing .innerHTML support for TABLE-related elements

if (document.all && !window.opera){

  Element.Methods.update = function(element, html) {

    element = $(element);

    html = typeof html == 'undefined' ? '' : html.toString();

    var tagName = element.tagName.toUpperCase();

    if (['THEAD','TBODY','TR','TD'].include(tagName)) {

      var div = document.createElement('div');

      switch (tagName) {

        case 'THEAD':

        case 'TBODY':

          div.innerHTML = '<table><tbody>' +  html.stripScripts() + '</tbody></table>';

          depth = 2;

          break;

        case 'TR':

          div.innerHTML = '<table><tbody><tr>' +  html.stripScripts() + '</tr></tbody></table>';

          depth = 3;

          break;

        case 'TD':

          div.innerHTML = '<table><tbody><tr><td>' +  html.stripScripts() + '</td></tr></tbody></table>';

          depth = 4;

      }

      $A(element.childNodes).each(function(node){

        element.removeChild(node)

      });

      depth.times(function(){ div = div.firstChild });



      $A(div.childNodes).each(

        function(node){ element.appendChild(node) });

    } else {

      element.innerHTML = html.stripScripts();

    }

    setTimeout(function() {html.evalScripts()}, 10);

    return element;

  }

};



Object.extend(Element, Element.Methods);



var _nativeExtensions = false;



if(/Konqueror|Safari|KHTML/.test(navigator.userAgent))

  ['', 'Form', 'Input', 'TextArea', 'Select'].each(function(tag) {

    var className = 'HTML' + tag + 'Element';

    if(window[className]) return;

    var klass = window[className] = {};

    klass.prototype = document.createElement(tag ? tag.toLowerCase() : 'div').__proto__;

  });



Element.addMethods = function(methods) {

  Object.extend(Element.Methods, methods || {});



  function copy(methods, destination, onlyIfAbsent) {

    onlyIfAbsent = onlyIfAbsent || false;

    var cache = Element.extend.cache;

    for (var property in methods) {

      var value = methods[property];

      if (!onlyIfAbsent || !(property in destination))

        destination[property] = cache.findOrStore(value);

    }

  }



  if (typeof HTMLElement != 'undefined') {

    copy(Element.Methods, HTMLElement.prototype);

    copy(Element.Methods.Simulated, HTMLElement.prototype, true);

    copy(Form.Methods, HTMLFormElement.prototype);

    [HTMLInputElement, HTMLTextAreaElement, HTMLSelectElement].each(function(klass) {

      copy(Form.Element.Methods, klass.prototype);

    });

    _nativeExtensions = true;

  }

}



var Toggle = new Object();

Toggle.display = Element.toggle;



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



Abstract.Insertion = function(adjacency) {

  this.adjacency = adjacency;

}



Abstract.Insertion.prototype = {

  initialize: function(element, content) {

    this.element = $(element);

    this.content = content.stripScripts();



    if (this.adjacency && this.element.insertAdjacentHTML) {

      try {

        this.element.insertAdjacentHTML(this.adjacency, this.content);

      } catch (e) {

        var tagName = this.element.tagName.toUpperCase();

        if (['TBODY', 'TR'].include(tagName)) {

          this.insertContent(this.contentFromAnonymousTable());

        } else {

          throw e;

        }

      }

    } else {

      this.range = this.element.ownerDocument.createRange();

      if (this.initializeRange) this.initializeRange();

      this.insertContent([this.range.createContextualFragment(this.content)]);

    }



    setTimeout(function() {content.evalScripts()}, 10);

  },



  contentFromAnonymousTable: function() {

    var div = document.createElement('div');

    div.innerHTML = '<table><tbody>' + this.content + '</tbody></table>';

    return $A(div.childNodes[0].childNodes[0].childNodes);

  }

}



var Insertion = new Object();



Insertion.Before = Class.create();

Insertion.Before.prototype = Object.extend(new Abstract.Insertion('beforeBegin'), {

  initializeRange: function() {

    this.range.setStartBefore(this.element);

  },



  insertContent: function(fragments) {

    fragments.each((function(fragment) {

      this.element.parentNode.insertBefore(fragment, this.element);

    }).bind(this));

  }

});



Insertion.Top = Class.create();

Insertion.Top.prototype = Object.extend(new Abstract.Insertion('afterBegin'), {

  initializeRange: function() {

    this.range.selectNodeContents(this.element);

    this.range.collapse(true);

  },



  insertContent: function(fragments) {

    fragments.reverse(false).each((function(fragment) {

      this.element.insertBefore(fragment, this.element.firstChild);

    }).bind(this));

  }

});



Insertion.Bottom = Class.create();

Insertion.Bottom.prototype = Object.extend(new Abstract.Insertion('beforeEnd'), {

  initializeRange: function() {

    this.range.selectNodeContents(this.element);

    this.range.collapse(this.element);

  },



  insertContent: function(fragments) {

    fragments.each((function(fragment) {

      this.element.appendChild(fragment);

    }).bind(this));

  }

});



Insertion.After = Class.create();

Insertion.After.prototype = Object.extend(new Abstract.Insertion('afterEnd'), {

  initializeRange: function() {

    this.range.setStartAfter(this.element);

  },



  insertContent: function(fragments) {

    fragments.each((function(fragment) {

      this.element.parentNode.insertBefore(fragment,

        this.element.nextSibling);

    }).bind(this));

  }

});



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



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);

var Selector = Class.create();

Selector.prototype = {

  initialize: function(expression) {

    this.params = {classNames: []};

    this.expression = expression.toString().strip();

    this.parseExpression();

    this.compileMatcher();

  },



  parseExpression: function() {

    function abort(message) { throw 'Parse error in selector: ' + message; }



    if (this.expression == '')  abort('empty expression');



    var params = this.params, expr = this.expression, match, modifier, clause, rest;

    while (match = expr.match(/^(.*)\[([a-z0-9_:-]+?)(?:([~\|!]?=)(?:"([^"]*)"|([^\]\s]*)))?\]$/i)) {

      params.attributes = params.attributes || [];

      params.attributes.push({name: match[2], operator: match[3], value: match[4] || match[5] || ''});

      expr = match[1];

    }



    if (expr == '*') return this.params.wildcard = true;



    while (match = expr.match(/^([^a-z0-9_-])?([a-z0-9_-]+)(.*)/i)) {

      modifier = match[1], clause = match[2], rest = match[3];

      switch (modifier) {

        case '#':       params.id = clause; break;

        case '.':       params.classNames.push(clause); break;

        case '':

        case undefined: params.tagName = clause.toUpperCase(); break;

        default:        abort(expr.inspect());

      }

      expr = rest;

    }



    if (expr.length > 0) abort(expr.inspect());

  },



  buildMatchExpression: function() {

    var params = this.params, conditions = [], clause;



    if (params.wildcard)

      conditions.push('true');

    if (clause = params.id)

      conditions.push('element.readAttribute("id") == ' + clause.inspect());

    if (clause = params.tagName)

      conditions.push('element.tagName.toUpperCase() == ' + clause.inspect());

    if ((clause = params.classNames).length > 0)

      for (var i = 0, length = clause.length; i < length; i++)

        conditions.push('element.hasClassName(' + clause[i].inspect() + ')');

    if (clause = params.attributes) {

      clause.each(function(attribute) {

        var value = 'element.readAttribute(' + attribute.name.inspect() + ')';

        var splitValueBy = function(delimiter) {

          return value + ' && ' + value + '.split(' + delimiter.inspect() + ')';

        }



        switch (attribute.operator) {

          case '=':       conditions.push(value + ' == ' + attribute.value.inspect()); break;

          case '~=':      conditions.push(splitValueBy(' ') + '.include(' + attribute.value.inspect() + ')'); break;

          case '|=':      conditions.push(

                            splitValueBy('-') + '.first().toUpperCase() == ' + attribute.value.toUpperCase().inspect()

                          ); break;

          case '!=':      conditions.push(value + ' != ' + attribute.value.inspect()); break;

          case '':

          case undefined: conditions.push('element.hasAttribute(' + attribute.name.inspect() + ')'); break;

          default:        throw 'Unknown operator ' + attribute.operator + ' in selector';

        }

      });

    }



    return conditions.join(' && ');

  },



  compileMatcher: function() {

    this.match = new Function('element', 'if (!element.tagName) return false;element = $(element); \
	return ' + this.buildMatchExpression());},

  findElements: function(scope) {

    var element;



    if (element = $(this.params.id))

      if (this.match(element))

        if (!scope || Element.childOf(element, scope))

          return [element];



    scope = (scope || document).getElementsByTagName(this.params.tagName || '*');



    var results = [];

    for (var i = 0, length = scope.length; i < length; i++)

      if (this.match(element = scope[i]))

        results.push(Element.extend(element));



    return results;

  },



  toString: function() {

    return this.expression;

  }

}



Object.extend(Selector, {

  matchElements: function(elements, expression) {

    var selector = new Selector(expression);

    return elements.select(selector.match.bind(selector)).map(Element.extend);

  },



  findElement: function(elements, expression, index) {

    if (typeof expression == 'number') index = expression, expression = false;

    return Selector.matchElements(elements, expression || '*')[index || 0];

  },



  findChildElements: function(element, expressions) {

    return expressions.map(function(expression) {

      return expression.match(/[^\s"]+(?:"[^"]*"[^\s"]+)*/g).inject([null], function(results, expr) {

        var selector = new Selector(expr);

        return results.inject([], function(elements, result) {

          return elements.concat(selector.findElements(result || element));

        });

      });

    }).flatten();

  }

});



function $$() {

  return Selector.findChildElements(document, $A(arguments));

}

var Form = {

  reset: function(form) {

    $(form).reset();

    return form;

  },



  serializeElements: function(elements, getHash) {

    var data = elements.inject({}, function(result, element) {

      if (!element.disabled && element.name) {

        var key = element.name, value = $(element).getValue();

        if (value != undefined) {

          if (result[key]) {

            if (result[key].constructor != Array) result[key] = [result[key]];

            result[key].push(value);

          }

          else result[key] = value;

        }

      }

      return result;

    });



    return getHash ? data : Hash.toQueryString(data);

  }

};



Form.Methods = {

  serialize: function(form, getHash) {

    return Form.serializeElements(Form.getElements(form), getHash);

  },



  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().each(function(element) {

      element.blur();

      element.disabled = 'true';

    });

    return form;

  },



  enable: function(form) {

    form = $(form);

    form.getElements().each(function(element) {

      element.disabled = '';

    });

    return form;

  },



  findFirstElement: function(form) {

    return $(form).getElements().find(function(element) {

      return element.type != 'hidden' && !element.disabled &&

        ['input', 'select', 'textarea'].include(element.tagName.toLowerCase());

    });

  },



  focusFirstElement: function(form) {

    form = $(form);

    form.findFirstElement().activate();

    return form;

  }

}



Object.extend(Form, Form.Methods);



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



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 Hash.toQueryString(pair);

      }

    }

    return '';

  },



  getValue: function(element) {

    element = $(element);

    var method = element.tagName.toLowerCase();

    return Form.Element.Serializers[method](element);

  },



  clear: function(element) {

    $(element).value = '';

    return element;

  },



  present: function(element) {

    return $(element).value != '';

  },



  activate: function(element) {

    element = $(element);

    element.focus();

    if (element.select && ( element.tagName.toLowerCase() != 'input' ||

      !['button', 'reset', 'submit'].include(element.type) ) )

      element.select();

    return element;

  },



  disable: function(element) {

    element = $(element);

    element.disabled = true;

    return element;

  },



  enable: function(element) {

    element = $(element);

    element.blur();

    element.disabled = false;

    return element;

  }

}



Object.extend(Form.Element, Form.Element.Methods);

var Field = Form.Element;

var $F = Form.Element.getValue;



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



Form.Element.Serializers = {

  input: function(element) {

    switch (element.type.toLowerCase()) {

      case 'checkbox':

      case 'radio':

        return Form.Element.Serializers.inputSelector(element);

      default:

        return Form.Element.Serializers.textarea(element);

    }

  },



  inputSelector: function(element) {

    return element.checked ? element.value : null;

  },



  textarea: function(element) {

    return element.value;

  },



  select: function(element) {

    return this[element.type == 'select-one' ?

      'selectOne' : 'selectMany'](element);

  },



  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 = function() {}

Abstract.TimedObserver.prototype = {

  initialize: function(element, frequency, callback) {

    this.frequency = frequency;

    this.element   = $(element);

    this.callback  = callback;



    this.lastValue = this.getValue();

    this.registerCallback();

  },



  registerCallback: function() {

    setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);

  },



  onTimerEvent: function() {

    var value = this.getValue();

    var changed = ('string' == typeof this.lastValue && 'string' == typeof value

      ? this.lastValue != value : String(this.lastValue) != String(value));

    if (changed) {

      this.callback(this.element, value);

      this.lastValue = value;

    }

  }

}



Form.Element.Observer = Class.create();

Form.Element.Observer.prototype = Object.extend(new Abstract.TimedObserver(), {

  getValue: function() {

    return Form.Element.getValue(this.element);

  }

});



Form.Observer = Class.create();

Form.Observer.prototype = Object.extend(new Abstract.TimedObserver(), {

  getValue: function() {

    return Form.serialize(this.element);

  }

});



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



Abstract.EventObserver = function() {}

Abstract.EventObserver.prototype = {

  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.bind(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();

Form.Element.EventObserver.prototype = Object.extend(new Abstract.EventObserver(), {

  getValue: function() {

    return Form.Element.getValue(this.element);

  }

});



Form.EventObserver = Class.create();

Form.EventObserver.prototype = Object.extend(new Abstract.EventObserver(), {

  getValue: function() {

    return Form.serialize(this.element);

  }

});

if (!window.Event) {

  var Event = new Object();

}



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,



  element: function(event) {

    return event.target || event.srcElement;

  },



  isLeftClick: function(event) {

    return (((event.which) && (event.which == 1)) ||

            ((event.button) && (event.button == 1)));

  },



  pointerX: function(event) {

    return event.pageX || (event.clientX +

      (document.documentElement.scrollLeft || document.body.scrollLeft));

  },



  pointerY: function(event) {

    return event.pageY || (event.clientY +

      (document.documentElement.scrollTop || document.body.scrollTop));

  },



  stop: function(event) {

    if (event.preventDefault) {

      event.preventDefault();

      event.stopPropagation();

    } else {

      event.returnValue = false;

      event.cancelBubble = true;

    }

  },



  // find the first node with the given tagName, starting from the

  // node the event was triggered on; traverses the DOM upwards

  findElement: function(event, tagName) {

    var element = Event.element(event);

    while (element.parentNode && (!element.tagName ||

        (element.tagName.toUpperCase() != tagName.toUpperCase())))

      element = element.parentNode;

    return element;

  },



  observers: false,



  _observeAndCache: function(element, name, observer, useCapture) {

    if (!this.observers) this.observers = [];

    if (element.addEventListener) {

      this.observers.push([element, name, observer, useCapture]);

      element.addEventListener(name, observer, useCapture);

    } else if (element.attachEvent) {

      this.observers.push([element, name, observer, useCapture]);

      element.attachEvent('on' + name, observer);

    }

  },



  unloadCache: function() {

    if (!Event.observers) return;

    for (var i = 0, length = Event.observers.length; i < length; i++) {

      Event.stopObserving.apply(this, Event.observers[i]);

      Event.observers[i][0] = null;

    }

    Event.observers = false;

  },



  observe: function(element, name, observer, useCapture) {

    element = $(element);

    useCapture = useCapture || false;



    if (name == 'keypress' &&

        (navigator.appVersion.match(/Konqueror|Safari|KHTML/)

        || element.attachEvent))

      name = 'keydown';



    Event._observeAndCache(element, name, observer, useCapture);

  },



  stopObserving: function(element, name, observer, useCapture) {

    element = $(element);

    useCapture = useCapture || false;



    if (name == 'keypress' &&

        (navigator.appVersion.match(/Konqueror|Safari|KHTML/)

        || element.detachEvent))

      name = 'keydown';



    if (element.removeEventListener) {

      element.removeEventListener(name, observer, useCapture);

    } else if (element.detachEvent) {

      try {

        element.detachEvent('on' + name, observer);

      } catch (e) {}

    }

  }

});



/* prevent memory leaks in IE */

if (navigator.appVersion.match(/\bMSIE\b/))

  Event.observe(window, 'unload', Event.unloadCache, false);

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;

  },



  realOffset: function(element) {

    var valueT = 0, valueL = 0;

    do {

      valueT += element.scrollTop  || 0;

      valueL += element.scrollLeft || 0;

      element = element.parentNode;

    } while (element);

    return [valueL, valueT];

  },



  cumulativeOffset: function(element) {

    var valueT = 0, valueL = 0;

    do {

      valueT += element.offsetTop  || 0;

      valueL += element.offsetLeft || 0;

      element = element.offsetParent;

    } while (element);

    return [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 == 'relative' || p == 'absolute') break;

      }

    } while (element);

    return [valueL, valueT];

  },



  offsetParent: 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;

  },



  // 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 = this.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 = this.realOffset(element);



    this.xcomp = x + offsetcache[0] - this.deltaX;

    this.ycomp = y + offsetcache[1] - this.deltaY;

    this.offset = this.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;

  },



  page: 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)

        if (Element.getStyle(element,'position')=='absolute') break;



    } while (element = element.offsetParent);



    element = forElement;

    do {

      if (!window.opera || element.tagName=='BODY') {

        valueT -= element.scrollTop  || 0;

        valueL -= element.scrollLeft || 0;

      }

    } while (element = element.parentNode);



    return [valueL, valueT];

  },



  clone: function(source, target) {

    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 = Position.page(source);



    // find coordinate system to use

    target = $(target);

    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(target,'position') == 'absolute') {

      parent = Position.offsetParent(target);

      delta = Position.page(parent);

    }



    // 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)   target.style.left  = (p[0] - delta[0] + options.offsetLeft) + 'px';

    if(options.setTop)    target.style.top   = (p[1] - delta[1] + options.offsetTop) + 'px';

    if(options.setWidth)  target.style.width = source.offsetWidth + 'px';

    if(options.setHeight) target.style.height = source.offsetHeight + 'px';

  },



  absolutize: function(element) {

    element = $(element);

    if (element.style.position == 'absolute') return;

    Position.prepare();



    var offsets = Position.positionedOffset(element);

    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';

  },



  relativize: function(element) {

    element = $(element);

    if (element.style.position == 'relative') return;

    Position.prepare();



    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;

  }

}



// Safari returns margins on body which is incorrect if the child is absolutely

// positioned.  For performance reasons, redefine Position.cumulativeOffset for

// KHTML/WebKit only.

if (/Konqueror|Safari|KHTML/.test(navigator.userAgent)) {

  Position.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 [valueL, valueT];

  }

}



Element.addMethods();