/*  Prototype JavaScript framework, version 1.4.0
*  (c) 2005 Sam Stephenson <sam@conio.net>
*
*  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: '1.4.0',
   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 (property in source) {
      destination[property] = source[property];
   }
   return destination;
}

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;
   }
}

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;
   return function(event) {
      return __method.call(object, event || window.event);
   }
}

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; i < arguments.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() {
      setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
   },

   onTimerEvent: function() {
      if (!this.currentlyExecuting) {
         try {
            this.currentlyExecuting = true;
            this.callback();
         } finally {
            this.currentlyExecuting = false;
         }
      }
   }
}

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

function $() {
   var elements = new Array();

   for (var i = 0; i < arguments.length; i++) {
      var element = arguments[i];
      if (typeof element == 'string')
      element = document.getElementById(element);

      if (arguments.length == 1)
      return element;

      elements.push(element);
   }

   return elements;
}
Object.extend(String.prototype, {
   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(eval);
   },

   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[0].nodeValue : '';
   },

   toQueryParams: function() {
      var pairs = this.match(/^\??(.*)$/)[1].split('&');
      return pairs.inject({}, function(params, pairString) {
         var pair = pairString.split('=');
         params[pair[0]] = pair[1];
         return params;
      });
   },

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

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

      var camelizedString = this.indexOf('-') == 0
      ? oStringList[0].charAt(0).toUpperCase() + oStringList[0].substring(1)
      : oStringList[0];

      for (var i = 1, len = oStringList.length; i < len; i++) {
         var s = oStringList[i];
         camelizedString += s.charAt(0).toUpperCase() + s.substring(1);
      }

      return camelizedString;
   },

   inspect: function() {
      return "'" + this.replace('\\', '\\\\').replace("'", '\\\'') + "'";
   }
});

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

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;
      }
   },

   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 = true;
      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(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;
   },

   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.collect(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 (value >= (result || value))
         result = value;
      });
      return result;
   },

   min: function(iterator) {
      var result;
      this.each(function(value, index) {
         value = (iterator || Prototype.K)(value, index);
         if (value <= (result || value))
         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.collect(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.collect(Prototype.K);
   },

   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) {
         iterator(value = collections.pluck(index));
         return value;
      });
   },

   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; i < iterable.length; i++)
      results.push(iterable[i]);
      return results;
   }
}

Object.extend(Array.prototype, Enumerable);

Array.prototype._reverse = Array.prototype.reverse;

Object.extend(Array.prototype, {
   _each: function(iterator) {
      for (var i = 0; i < this.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 != undefined || value != null;
      });
   },

   flatten: function() {
      return this.inject([], function(array, value) {
         return array.concat(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; i < this.length; i++)
      if (this[i] == object) return i;
      return -1;
   },

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

   shift: function() {
      var result = this[0];
      for (var i = 0; i < this.length - 1; i++)
      this[i] = this[i + 1];
      this.length--;
      return result;
   },

   inspect: function() {
      return '[' + this.map(Object.inspect).join(', ') + ']';
   }
});
var Hash = {
   _each: function(iterator) {
      for (key in this) {
         var value = this[key];
         if (typeof value == 'function') 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 $H(hash).inject($H(this), function(mergedHash, pair) {
         mergedHash[pair.key] = pair.value;
         return mergedHash;
      });
   },

   toQueryString: function() {
      return this.map(function(pair) {
         return pair.map(encodeURIComponent).join('=');
      }).join('&');
   },

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

function $H(object) {
   var hash = Object.extend({}, object || {});
   Object.extend(hash, Enumerable);
   Object.extend(hash, Hash);
   return hash;
}
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;
      do {
         iterator(value);
         value = value.succ();
      } while (this.include(value));
   },

   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 ActiveXObject('Msxml2.XMLHTTP')},
      function() {return new ActiveXObject('Microsoft.XMLHTTP')},
      function() {return new XMLHttpRequest()}
      ) || false;
   },

   activeRequestCount: 0
}

Ajax.Responders = {
   responders: [],

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

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

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

   dispatch: function(callback, request, transport, json) {
      this.each(function(responder) {
         if (responder[callback] && 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,
         parameters:   ''
      }
      Object.extend(this.options, options || {});
   },

   responseIsSuccess: function() {
      return this.transport.status == undefined
      || this.transport.status == 0
      || (this.transport.status >= 200 && this.transport.status < 300);
   },

   responseIsFailure: function() {
      return !this.responseIsSuccess();
   }
}

Ajax.Request = Class.create();
Ajax.Request.Events =
['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];

Ajax.Request.prototype = Object.extend(new Ajax.Base(), {
   initialize: function(url, options) {
      this.transport = Ajax.getTransport();
      this.setOptions(options);
      this.request(url);
   },

   request: function(url) {
      var parameters = this.options.parameters || '';
      if (parameters.length > 0) parameters += '&_=';

      try {
         this.url = url;
         if (this.options.method == 'get' && parameters.length > 0)
         this.url += (this.url.match(/\?/) ? '&' : '?') + parameters;

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

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

         if (this.options.asynchronous) {
            this.transport.onreadystatechange = this.onStateChange.bind(this);
            setTimeout((function() {this.respondToReadyState(1)}).bind(this), 10);
         }

         this.setRequestHeaders();

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

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

   setRequestHeaders: function() {
      var requestHeaders =
      ['X-Requested-With', 'XMLHttpRequest',
      'X-Prototype-Version', Prototype.Version];

      if (this.options.method == 'post') {
         requestHeaders.push('Content-type',
         'application/x-www-form-urlencoded');

         /* Force "Connection: close" for Mozilla browsers to work around
         * a bug where XMLHttpReqeuest sends an incorrect Content-length
         * header. See Mozilla Bugzilla #246651.
         */
         if (this.transport.overrideMimeType)
         requestHeaders.push('Connection', 'close');
      }

      if (this.options.requestHeaders)
      requestHeaders.push.apply(requestHeaders, this.options.requestHeaders);

      for (var i = 0; i < requestHeaders.length; i += 2)
      this.transport.setRequestHeader(requestHeaders[i], requestHeaders[i+1]);
   },

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

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

   evalJSON: function() {
      try {
         return eval(this.header('X-JSON'));
      } catch (e) {}
   },

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

   respondToReadyState: function(readyState) {
      var event = Ajax.Request.Events[readyState];
      var transport = this.transport, json = this.evalJSON();

      if (event == 'Complete') {
         try {
         (this.options['on' + this.transport.status]
         || this.options['on' + (this.responseIsSuccess() ? 'Success' : 'Failure')]
         || Prototype.emptyFunction)(transport, json);
         } catch (e) {
            this.dispatchException(e);
         }

         if ((this.header('Content-type') || '').match(/^text\/javascript/i))
         this.evalResponse();
      }

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

      /* Avoid memory leak in MSIE: clean up the oncomplete event handler */
      if (event == 'Complete')
      this.transport.onreadystatechange = Prototype.emptyFunction;
   },

   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.containers = {
         success: container.success ? $(container.success) : $(container),
         failure: 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, object) {
         this.updateContent();
         onComplete(transport, object);
      }).bind(this);

      this.request(url);
   },

   updateContent: function() {
      var receiver = this.responseIsSuccess() ?
      this.containers.success : this.containers.failure;
      var response = this.transport.responseText;

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

      if (receiver) {
         if (this.options.insertion) {
            new this.options.insertion(receiver, response);
         } else {
            Element.update(receiver, response);
         }
      }

      if (this.responseIsSuccess()) {
         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.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);
   }
});
document.getElementsByClassName = function(className, parentElement) {
   var children = ($(parentElement) || document.body).getElementsByTagName('*');
   return $A(children).inject([], function(elements, child) {
      if (child.className.match(new RegExp("(^|\\s)" + className + "(\\s|$)")))
      elements.push(child);
      return elements;
   });
}

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

if (!window.Element) {
   var Element = new Object();
}

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

   toggle: function() {
      for (var i = 0; i < arguments.length; i++) {
         var element = $(arguments[i]);
         Element[Element.visible(element) ? 'hide' : 'show'](element);
      }
   },

   hide: function() {
      for (var i = 0; i < arguments.length; i++) {
         var element = $(arguments[i]);
         element.style.display = 'none';
      }
   },

   show: function() {
      for (var i = 0; i < arguments.length; i++) {
         var element = $(arguments[i]);
         element.style.display = '';
      }
   },

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

   update: function(element, html) {
      $(element).innerHTML = html.stripScripts();
      setTimeout(function() {html.evalScripts()}, 10);
   },

   getHeight: function(element) {
      element = $(element);
      return element.offsetHeight;
   },

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

   hasClassName: function(element, className) {
      if (!(element = $(element))) return;
      return Element.classNames(element).include(className);
   },

   addClassName: function(element, className) {
      if (!(element = $(element))) return;
      return Element.classNames(element).add(className);
   },

   removeClassName: function(element, className) {
      if (!(element = $(element))) return;
      return Element.classNames(element).remove(className);
   },

   // removes whitespace-only text node children
   cleanWhitespace: function(element) {
      element = $(element);
      for (var i = 0; i < element.childNodes.length; i++) {
         var node = element.childNodes[i];
         if (node.nodeType == 3 && !/\S/.test(node.nodeValue))
         Element.remove(node);
      }
   },

   empty: function(element) {
      return $(element).innerHTML.match(/^\s*$/);
   },

   scrollTo: function(element) {
      element = $(element);
      var x = element.x ? element.x : element.offsetLeft,
      y = element.y ? element.y : element.offsetTop;
      window.scrollTo(x, y);
   },

   getStyle: function(element, style) {
      element = $(element);
      var value = element.style[style.camelize()];
      if (!value) {
         if (document.defaultView && document.defaultView.getComputedStyle) {
            var css = document.defaultView.getComputedStyle(element, null);
            value = css ? css.getPropertyValue(style) : null;
         } else if (element.currentStyle) {
            value = element.currentStyle[style.camelize()];
         }
      }

      if (window.opera && ['left', 'top', 'right', 'bottom'].include(style))
      if (Element.getStyle(element, 'position') == 'static') value = 'auto';

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

   setStyle: function(element, style) {
      element = $(element);
      for (name in style)
      element.style[name.camelize()] = style[name];
   },

   getDimensions: function(element) {
      element = $(element);
      if (Element.getStyle(element, 'display') != 'none')
      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;
      els.visibility = 'hidden';
      els.position = 'absolute';
      els.display = '';
      var originalWidth = element.clientWidth;
      var originalHeight = element.clientHeight;
      els.display = 'none';
      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;
         }
      }
   },

   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 = '';
      }
   },

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

   undoClipping: function(element) {
      element = $(element);
      if (element._overflow) return;
      element.style.overflow = element._overflow;
      element._overflow = undefined;
   }
});

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) {
            if (this.element.tagName.toLowerCase() == 'tbody') {
               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(this.toArray().concat(classNameToAdd).join(' '));
   },

   remove: function(classNameToRemove) {
      if (!this.include(classNameToRemove)) return;
      this.set(this.select(function(className) {
         return className != classNameToRemove;
      }).join(' '));
   },

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

Object.extend(Element.ClassNames.prototype, Enumerable);
var Field = {
   clear: function() {
      for (var i = 0; i < arguments.length; i++)
      $(arguments[i]).value = '';
   },

   focus: function(element) {
      $(element).focus();
   },

   present: function() {
      for (var i = 0; i < arguments.length; i++)
      if ($(arguments[i]).value == '') return false;
      return true;
   },

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

   activate: function(element) {
      element = $(element);
      element.focus();
      if (element.select)
      element.select();
   }
}

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

var Form = {
   serialize: function(form) {
      var elements = Form.getElements($(form));
      var queryComponents = new Array();

      for (var i = 0; i < elements.length; i++) {
         var queryComponent = Form.Element.serialize(elements[i]);
         if (queryComponent)
         queryComponents.push(queryComponent);
      }

      return queryComponents.join('&');
   },

   getElements: function(form) {
      form = $(form);
      var elements = new Array();

      for (tagName in Form.Element.Serializers) {
         var tagElements = form.getElementsByTagName(tagName);
         for (var j = 0; j < tagElements.length; j++)
         elements.push(tagElements[j]);
      }
      return elements;
   },

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

      if (!typeName && !name)
      return inputs;

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

      return matchingInputs;
   },

   disable: function(form) {
      var elements = Form.getElements(form);
      for (var i = 0; i < elements.length; i++) {
         var element = elements[i];
         element.blur();
         element.disabled = 'true';
      }
   },

   enable: function(form) {
      var elements = Form.getElements(form);
      for (var i = 0; i < elements.length; i++) {
         var element = elements[i];
         element.disabled = '';
      }
   },

   findFirstElement: function(form) {
      return Form.getElements(form).find(function(element) {
         return element.type != 'hidden' && !element.disabled &&
         ['input', 'select', 'textarea'].include(element.tagName.toLowerCase());
      });
   },

   focusFirstElement: function(form) {
      Field.activate(Form.findFirstElement(form));
   },

   reset: function(form) {
      $(form).reset();
   }
}

Form.Element = {
   serialize: function(element) {
      element = $(element);
      var method = element.tagName.toLowerCase();
      var parameter = Form.Element.Serializers[method](element);

      if (parameter) {
         var key = encodeURIComponent(parameter[0]);
         if (key.length == 0) return;

         if (parameter[1].constructor != Array)
         parameter[1] = [parameter[1]];

         return parameter[1].map(function(value) {
            return key + '=' + encodeURIComponent(value);
         }).join('&');
      }
   },

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

      if (parameter)
      return parameter[1];
   }
}

Form.Element.Serializers = {
   input: function(element) {
      switch (element.type.toLowerCase()) {
         case 'submit':
         case 'hidden':
         case 'password':
         case 'text':
         return Form.Element.Serializers.textarea(element);
         case 'checkbox':
         case 'radio':
         return Form.Element.Serializers.inputSelector(element);
      }
      return false;
   },

   inputSelector: function(element) {
      if (element.checked)
      return [element.name, element.value];
   },

   textarea: function(element) {
      return [element.name, element.value];
   },

   select: function(element) {
      return Form.Element.Serializers[element.type == 'select-one' ?
      'selectOne' : 'selectMany'](element);
   },

   selectOne: function(element) {
      var value = '', opt, index = element.selectedIndex;
      if (index >= 0) {
         opt = element.options[index];
         value = opt.value;
         if (!value && !('value' in opt))
         value = opt.text;
      }
      return [element.name, value];
   },

   selectMany: function(element) {
      var value = new Array();
      for (var i = 0; i < element.length; i++) {
         var opt = element.options[i];
         if (opt.selected) {
            var optValue = opt.value;
            if (!optValue && !('value' in opt))
            optValue = opt.text;
            value.push(optValue);
         }
      }
      return [element.name, value];
   }
}

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

var $F = Form.Element.getValue;

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

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();
      if (this.lastValue != value) {
         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() {
      var elements = Form.getElements(this.element);
      for (var i = 0; i < elements.length; i++)
      this.registerCallback(elements[i]);
   },

   registerCallback: function(element) {
      if (element.type) {
         switch (element.type.toLowerCase()) {
            case 'checkbox':
            case 'radio':
            Event.observe(element, 'click', this.onElementEvent.bind(this));
            break;
            case 'password':
            case 'text':
            case 'textarea':
            case 'select-one':
            case 'select-multiple':
            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,

   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; i < Event.observers.length; i++) {
         Event.stopObserving.apply(this, Event.observers[i]);
         Event.observers[i][0] = null;
      }
      Event.observers = false;
   },

   observe: function(element, name, observer, useCapture) {
      var element = $(element);
      useCapture = useCapture || false;

      if (name == 'keypress' &&
      (navigator.appVersion.match(/Konqueror|Safari|KHTML/)
      || element.attachEvent))
      name = 'keydown';

      this._observeAndCache(element, name, observer, useCapture);
   },

   stopObserving: function(element, name, observer, useCapture) {
      var 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) {
         element.detachEvent('on' + name, observer);
      }
   }
});

/* prevent memory leaks in IE */
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) {
            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;
   },

   clone: function(source, target) {
      source = $(source);
      target = $(target);
      target.style.position = 'absolute';
      var offsets = this.cumulativeOffset(source);
      target.style.top    = offsets[1] + 'px';
      target.style.left   = offsets[0] + 'px';
      target.style.width  = source.offsetWidth + 'px';
      target.style.height = source.offsetHeight + 'px';
   },

   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 {
         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];
   }
}