function hideObject(id) {
		document.getElementById(id).style.visibility="hidden";
}

function showObject(id) {
		document.getElementById(id).style.visibility="visible";
}

var ActiveMenu;
ActiveMenu = "";

function HideMenu() {
	if (ActiveMenu !== "") {
		hideObject(ActiveMenu);
		ActiveMenu = "";
	}
}
function ShowMenu(menuId) {
	HideMenu();
	showObject(menuId);
	ActiveMenu = menuId;
}

var ActiveSubMenu;
ActiveSubMenu = "";

function HideSubMenu() {
	if (ActiveSubMenu !== "") {
		hideObject(ActiveSubMenu);
		ActiveSubMenu = "";
	}
}
function ShowSubMenu(menuId) {
	HideSubMenu();
	showObject(menuId);
	ActiveSubMenu = menuId;
}