function openMenu(elementId)
{
		var el = document.getElementById(elementId);
	if (Element.childElements(el)) {
		var uL = Element.childElements(el)[1];
		var iS = true;
	}
		var opened = getElementsByClassName(document.getElementById("nav-left"), "li", "open");
	for (var i = 0, j = opened.length; i < j; i++) {
		if (opened[i] == el) {
			var isAlreadyOpen = true;
		}
		Element.removeClassName(opened[i], 'open');
		if(iS){ uL.removeClassName('shown-sub')};
	}
		if (isAlreadyOpen) {
		Element.removeClassName(el, 'open');
		if(iS){ uL.removeClassName('shown-sub')};
	} else {
		Element.addClassName(el, 'open');
		if(iS){ uL.addClassName('shown-sub')};
	}
}