//open menu with given ID 
		function openMenu(menuID,linkObj)
		{
			//if the menu code is ready
			if(um.ready)
			{
				//find co-ordinates of link object
				var coords = {
					'x' : um.getRealPosition(linkObj,'x'),
					'y' : um.getRealPosition(linkObj,'y')
					};
					
				//increase y-position to place it below the link
				coords.y += (linkObj.offsetHeight + 4);
				
				//activate menu at returned co-ordinates
				um.activateMenu(menuID, coords.x + 'px', coords.y + 'px');
			}
		}
		
		//close menu with given ID
		function closeMenu(menuID)
		{
			//if the menu code is ready
			if(um.ready)
			{
				//deactive menu
				um.deactivateMenu(menuID);
			}
		}