// Cross-browser event handling for IE5+, NS6+ and Mozilla/Gecko
// By Scott Andrew
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;
	}
}