function addEvent(obj, type, fn) {
	if (obj.attachEvent) {
		obj['e'+type+fn] = fn;
		obj[type+fn] = function(){obj['e'+type+fn](window.event);}
		obj.attachEvent('on'+type, obj[type+fn]);
	} else {
		obj.addEventListener(type, fn, false);
	}
}

function removeEvent( obj, type, fn ) {
	if (obj.detachEvent) {
		obj.detachEvent('on'+type, obj[type+fn]);
		obj[type+fn] = null;
	} else {
		obj.removeEventListener(type, fn, false);
	}
}

function $() {
	var elements = new Array();
	for (var i = 0; i < arguments.length; i++) {
		var element = arguments[i];
		if (typeof element == 'string')
			element = document.getElementById(element);
		if (arguments.length == 1)
			return element;
		elements.push(element);
	}
	return elements;
}

function getElementsByClass(searchClass,node,tag) {
	var classElements = new Array();
	if (node == null)
		node = document;
	if (tag == null)
		tag = '*';
	var els = node.getElementsByTagName(tag);
	var elsLen = els.length;
	var pattern = new RegExp('(^|\\s)'+searchClass+'(\\s|$)');
	for (i = 0, j = 0; i < elsLen; i++) {
		if ( pattern.test(els[i].className) ) {
			classElements[j] = els[i];
			j++;
		}
	}
	return classElements;
}