function ButtonOver() {
	var toEl = event.toElement; 
	if(toEl==null) return;
	if(toEl.className=='button') toEl.className = "buttonActive";
}

function ButtonOut() {
	var fromEl = event.fromElement;
	if(fromEl==null) return;
	if(fromEl.className=='buttonActive') fromEl.className = "button";
}