function addEvent(element, type, handler)
{
	if (element.addEventListener)
		element.addEventListener(type, handler, false);
	else
	{
		if (!handler.$$guid) handler.$$guid = addEvent.guid++;
		if (!element.events) element.events = {};
		var handlers = element.events[type];
		if (!handlers)
		{
			handlers = element.events[type] = {};
			if (element['on' + type]) handlers[0] = element['on' + type];
			element['on' + type] = handleEvent;
		}
	
		handlers[handler.$$guid] = handler;
	}
}
addEvent.guid = 1;

function removeEvent(element, type, handler)
{
	if (element.removeEventListener)
		element.removeEventListener(type, handler, false);
	else if (element.events && element.events[type] && handler.$$guid)
		delete element.events[type][handler.$$guid];
}

function handleEvent(event)
{
	event = event || fixEvent(window.event);
	var returnValue = true;
	var handlers = this.events[event.type];

	for (var i in handlers)
	{
		if (!Object.prototype[i])
		{
			this.$$handler = handlers[i];
			if (this.$$handler(event) === false) returnValue = false;
		}
	}

	if (this.$$handler) this.$$handler = null;

	return returnValue;
}

function fixEvent(event)
{
	event.preventDefault = fixEvent.preventDefault;
	event.stopPropagation = fixEvent.stopPropagation;
	return event;
}
fixEvent.preventDefault = function()
{
	this.returnValue = false;
}
fixEvent.stopPropagation = function()
{
	this.cancelBubble = true;
}

// This little snippet fixes the problem that the onload attribute on the body-element will overwrite
// previous attached events on the window object for the onload event
if (!window.addEventListener)
{
	document.onreadystatechange = function()
	{
		if (window.onload && window.onload != handleEvent)
		{
			addEvent(window, 'load', window.onload);
			window.onload = handleEvent;
		}
	}
}

function getElementsByClassName(className, tag, elm){
	
  var testClass = new RegExp("(^|s)" + className + "(s|$)");
  var tag = tag || "*";
  var elm = elm || document;
  var elements = (tag == "*" && elm.all)? elm.all : elm.getElementsByTagName(tag);
  var returnElements = [];
  var current;
  var length = elements.length;
  for(var i=0; i<length; i++){
    current = elements[i ];
    if(testClass.test(current.className)){
      returnElements.push(current);
    }
  }
  return returnElements;
}