String.prototype.trim = function () {
    return this.replace(/^\s*/, "").replace(/\s*$/, "");
}



function swap_menu(element) {
	if (element.tagName.toLowerCase() == 'ul') {
		var listChilds = element.childNodes;
		for (var i = 0; i < listChilds.length; i++) {
			if ((listChilds.item(i).tagName == undefined) ||
				(listChilds.item(i).tagName == null) ||
				(listChilds.item(i).tagName.toLowerCase() != 'li'))
				continue;
			var entryChilds = listChilds.item(i).childNodes;
			listChilds.item(i).className = listChilds.item(i).className.replace('hover', '').trim();
			for (var j = 0; j < entryChilds.length; j++) {
				if ((entryChilds.item(j).tagName == undefined) ||
					(entryChilds.item(j).tagName == null) ||
					(entryChilds.item(j).tagName.toLowerCase() != 'ul'))
					continue;
				entryChilds.item(j).style.display = 'none';
			}
		}
	}
	else if (element.tagName.toLowerCase() == 'li') {
		element.className = (element.className + ' hover').trim();
		var entryChilds = element.childNodes;
		element.parentNode.parentNode.blocked = true;
		for (var j = 0; j < entryChilds.length; j++) {
			if ((entryChilds.item(j).tagName == undefined) ||
				(entryChilds.item(j).tagName == null) ||
				(entryChilds.item(j).tagName.toLowerCase() != 'ul'))
				continue;
			entryChilds.item(j).style.display = 'block';
			if (element.blocked)
				element.blocked = false;
			else			
				swap_menu(entryChilds.item(j));
		}
	}
}