//Display submenu
function show(caller, target_id) {
	var submenu = document.getElementById(target_id);
	for (var i = 1; i<=10; i++) {
		if (document.getElementById('smenu'+i)) {
			document.getElementById('smenu'+i).style.visibility='hidden';
		}
	}
	if (submenu && caller) {
		submenu.style.visibility='visible';
		submenu.style.left = caller.offsetLeft + 10 + "px";
		submenu.style.top = caller.offsetTop + 20 + "px";
	}
}