var objCurrentSubmenu = null;
var submenuTimer;
function showSubmenu(submenuId){
	clearSubmenu();
	objCurrentSubmenu = getObjById(submenuId);
	objCurrentSubmenu.style.visibility = "visible";
	clearTimeout(submenuTimer);
}
function hideSubmenu(){
	submenuTimer=setTimeout('clearSubmenu()', 700);
}
function keepSubmenu(){
	clearTimeout(submenuTimer);
}
function clearSubmenu(){
	if(objCurrentSubmenu){
		objCurrentSubmenu.style.visibility = "hidden";
	}
	objCurrentSubmenu = null;
}