if (mtDropDown.isSupported()) 
		{
			var ms = new mtDropDownSet(mtDropDown.direction.down, 0, 0, mtDropDown.reference.bottomLeft);

var	menu1	=	ms.addMenu(document.getElementById("mainmenu1"));
menu1.addItem("关于我们",	"/userlist/admin/text-17987.html","");

			mtDropDown.renderAll();
		}
		//初始菜单
		window.onload = init;