var current = null;

function showSub(menu,test) {
		if (current) { hideSub(current); }
		if (menu) {
			current = menu;
			document.getElementById(menu).style.position = 'relative';
			document.getElementById(menu).style.visibility = 'visible';
			document.getElementById(menu).style.display = 'block';
		}
		else if (current) { hideSub(); }	
}
function hideSub() {
		if (current) {
			document.getElementById(current).style.position = 'absolute';
			document.getElementById(current).style.visibility = 'hidden';
			document.getElementById(current).style.display = 'none';
			current = null;
		}
}