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

function addEventToId(id, evType, fn) {
  if (document.getElementById) {
    var obj = document.getElementById(id);
    if (obj) addEvent(obj, evType, fn);
    else alert("Object \""+obj+"\" does not exist");
  }
}