curId = 0;
function hideSubmenu () {
	if (curId) setDisplay ("TR_submenu_"+curId, 0);
	curId = 0;
}
function menuOnMouseover (id) {
	hideSubmenu ();
	if (elementExists ("TR_submenu_"+id)) {
		curId = id;
		setDisplay ("TR_submenu_"+curId, 1);
	} else {
		curId = 0;
	}
}