function addEvent(elm, evType, fn, useCapture)
{
	if(elm.addEventListener){
		elm.addEventListener(evType, fn, useCapture);
		return true;
		}
	else if(elm.attachEvent){
		var r = elm.attachEvent('on' + evType, fn);
		return r;
		}
	else{
		elm['on' + evType] = fn;
		}
}