var isIE = (window.navigator.userAgent.indexOf("MSIE") > 0);
	
	function addCrossEvent(eventName, eventHandler)
	{
		if(isIE)
		{
			document.attachEvent('on' + eventName, eventHandler);
		}
		else
		{
			addEventListener('on' +eventName,  eventHandler(), false);
		}
	}
	
	function removeCrossEvent(eventName, eventHandler)
	{
		if(isIE)
		{
			document.dttachEvent('on' + eventName, eventHandler);
		}
		else
		{
			removeEventListener('on' +eventName, eventHandler(), false);
		}
	}
	
	function addEventListener(evtName, func, useCapture) 
	{
    		document["on"+evtName] = func;
  	} 
  	
	function removeEventListener(evtName, func, useCapture) 
	{
	   document["on"+evtName] = null;
	} 

	document.addEventListener = addEventListener; 
  	document.removeEventListener = removeEventListener;