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

var	menu3	=	ms.addMenu(document.getElementById("mainmenu3"));
menu3.addItem("POM PP塑料轴承",	"/index.php/text/ypy/1/cn/1434/1108.html","");
menu3.addItem("特耐高温轴承系列",	"/index.php/text/ypy/1/cn/1435/1108.html","");

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