var Core = {}; if (document.addEventListener) { Core.addEventListener = function(target, type, listener) { target.addEventListener(type, listener, false); }; Core.removeEventListener = function(target, type, listener) { target.removeEventListener(type, listener, false); }; Core.preventDefault = function(event) { event.preventDefault(); }; Core.stopPropagation = function(event) { event.stopPropagation(); }; } 
else if (document.attachEvent){  Core.addEventListener = function(target, type, listener)  {  if (Core._findListener(target, type, listener) != -1) return; var listener2 = function() { var event = window.event;

      if (Function.prototype.call)
      {
        listener.call(target, event);
      }
      else
      {
        target._currentListener = listener;
        target._currentListener(event)
        target._currentListener = null;
      }
    };

    
    target.attachEvent("on" + type, listener2);

    
    var listenerRecord =
    {
      target: target,
      type: type,
      listener: listener,
      listener2: listener2
    };

    
    var targetDocument = target.document || target;
    var targetWindow = targetDocument.parentWindow;

    
    var listenerId = "l" + Core._listenerCounter++;

    
    if (!targetWindow._allListeners) targetWindow._allListeners = {};
    targetWindow._allListeners[listenerId] = listenerRecord;

   
    if (!target._listeners) target._listeners = [];
    target._listeners[target._listeners.length] = listenerId;

   
    if (!targetWindow._unloadListenerAdded)
    {
      targetWindow._unloadListenerAdded = true;
      targetWindow.attachEvent("onunload", Core._removeAllListeners);
    }
  };

  Core.removeEventListener = function(target, type, listener)
  {
   
    var listenerIndex = Core._findListener(target, type, listener);
    if (listenerIndex == -1) return;

   
    var targetDocument = target.document || target;
    var targetWindow = targetDocument.parentWindow;

   
    var listenerId = target._listeners[listenerIndex];
    var listenerRecord = targetWindow._allListeners[listenerId];

   
    target.detachEvent("on" + type, listenerRecord.listener2);
    target._listeners.splice(listenerIndex, 1);

   
    delete targetWindow._allListeners[listenerId];
  };

  Core.preventDefault = function(event)
  {
    event.returnValue = false;
  };

  Core.stopPropagation = function(event)
  {
    event.cancelBubble = true;
  };

  Core._findListener = function(target, type, listener)
  {
   
    var listeners = target._listeners;
    if (!listeners) return -1;

   
    var targetDocument = target.document || target;
    var targetWindow = targetDocument.parentWindow;

   
    for (var i = listeners.length - 1; i >= 0; i--)
    {
   
      var listenerId = listeners[i];

   
      var listenerRecord = targetWindow._allListeners[listenerId];

   
      if (listenerRecord.type == type && listenerRecord.listener == listener)
      {
        return i;
      }
    }
    return -1;
  };

  Core._removeAllListeners = function()
  {
    var targetWindow = this;

    for (id in targetWindow._allListeners)
    {
      var listenerRecord = targetWindow._allListeners[id];
      listenerRecord.target.detachEvent(
          "on" + listenerRecord.type, listenerRecord.listener2);
      delete targetWindow._allListeners[id];
    }
  };

  Core._listenerCounter = 0;
}

Core.addClass = function(target, theClass)
{
  if (!Core.hasClass(target, theClass))
  {
    if (target.className == "")
    {
      target.className = theClass;
    }
    else
    {
      target.className += " " + theClass;
    }
  }
};

Core.getElementsByClass = function(theClass)
{
  var elementArray = [];

  if (document.all)
  {
    elementArray = document.all;
  }
  else
  {
    elementArray = document.getElementsByTagName("*");
  }

  var matchedArray = [];
  var pattern = new RegExp("(^| )" + theClass + "( |$)");

  for (var i = 0; i < elementArray.length; i++)
  {
    if (pattern.test(elementArray[i].className))
    {
      matchedArray[matchedArray.length] = elementArray[i];
    }
  }

  return matchedArray;
};

Core.hasClass = function(target, theClass)
{
  var pattern = new RegExp("(^| )" + theClass + "( |$)");

  if (pattern.test(target.className))
  {
    return true;
  }

  return false;
};

Core.removeClass = function(target, theClass)
{
  var pattern = new RegExp("(^| )" + theClass + "( |$)");

  target.className = target.className.replace(pattern, "$1");
  target.className = target.className.replace(/ $/, "");
};

Core.getComputedStyle = function(element, styleProperty)
{
  var computedStyle = null;

  if (typeof element.currentStyle != "undefined")
  {
    computedStyle = element.currentStyle;
  }
  else
  {
    computedStyle = document.defaultView.getComputedStyle(element, null);
  }

  return computedStyle[styleProperty];
};

Core.start = function(runnable)
{
  Core.addEventListener(window, "load", runnable.init);
};