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;
}

function switchCssClass(obj, name, turnOn) {
	var clazz = obj.className ? obj.className : "";
	if (turnOn == undefined) {
		turnOn = clazz.indexOf(name) == -1
	}
	if (turnOn === false) {
		obj.className = clazz.replace(new RegExp("\s?" + name, "g"), "");
	} else if (turnOn === true) {
		obj.className = obj.className ? (obj.className + " " + name) : name;
	}
}

function toggleElement(id, className, nodeId, tag) {
	var collection = getElementsByClass(className, document.getElementById(nodeId), tag);
	var el = document.getElementById(id);
	switchCssClass(el, "opened", el.className.indexOf("opened") < 0);
	for (var i = 0; i < collection.length; i++) {
		if(collection[i] == el) continue;
		switchCssClass(collection[i], "opened", false);
	}
}