Listener

addListener = function addListener(element, type, func)
{
	if(element) {
		if (element.addEventListener) {
			element.addEventListener(type, func, false);
		}
		else if (element.attachEvent) {
			element.attachEvent("on" + type, func);
		}
	}
}

removeListener = function removeListener(element, type, func)
{
	if(element) {
	    if(element.removeEventListener){
	        element.removeEventListener(type, func, false);
	    }
		else if(element.detachEvent){
	        element.detachEvent("on" + type, func);
	    }
	}
}