var openMenu;
function showsubmenu(id) {
	var elem= document.getElementById(id);
	if (elem.style.display == "block") {
		elem.style.display = "none";
		openMenu=undefined;
	} else {
		elem.style.display = "block";
		if (openMenu) {
			openMenu.style.display = "none";
		}	
		openMenu = elem;
	}
}
function hidesubmenu(elem) {
	elem.style.display = "none";
}