function initpagelayout()  {
	//menudiv
	new Ajax.Updater('menudiv', './html/menu.html');
}

function showsubmenu(ntop,nleft)  {
	hidesubmenu();
	var submenu = document.getElementById("submenu");
	submenu.style.visibility = 'visible';
	submenu.style.top = ntop;
	submenu.style.left = nleft;		
	new Effect.SlideDown('submenu'); 
	return false;	
}
function hidesubmenu()  {
	var submenu = document.getElementById("submenu");
	submenu.style.visibility = 'hidden';
}