var LastViewdItem = null;
  	function showMenu(menuId)
	{

                var submenu = document.getElementById("subMenu"+menuId);

                if (submenu != null){
                        hideMenu();
            	        submenu.style.display = "block";
    	            	LastViewdItem = submenu;
        	}
        }

	function hideMenu()
	{
        	if (LastViewdItem != null){
			LastViewdItem.style.display = "none";
		}

	}