active_submenu = null;
document.onclick = close_active_submenu;
	   
function close_active_submenu()
{
	if (active_submenu != null)
	{
		active_submenu.style.display = "none";
		active_submenu = null;
	}
}

function close_submenu () {
	
	
	
}

function show_submenu(id)
{
	close_active_submenu();
	active_submenu = document.getElementById(id);
	active_submenu.style.display = "block";
}