if (mtDropDown.isSupported()) {
		var ms = new mtDropDownSet(mtDropDown.direction.down, 0, 0, mtDropDown.reference.bottomLeft);
		var menu3 = ms.addMenu(document.getElementById("menu3"));
menu3.addItem("产品查询", "product/search.asp");
menu3.addItem("Dynacord", "product/index.asp?classid=4");
menu3.addItem("Electro-Voice", "product/index.asp?classid=3");
menu3.addItem("RTS", "product/index.asp?classid=6");
menu3.addItem("TELEX", "product/index.asp?classid=2");
var menu4 = ms.addMenu(document.getElementById("menu4"));
menu4.addItem("公共广播系统", "system/index.asp?ClassID=4"); 
menu4.addItem("内部通讯系统", "system/index.asp?ClassID=5"); 
menu4.addItem("专业扩声系统", "system/index.asp?ClassID=3"); 
		var menu5 = ms.addMenu(document.getElementById("menu5"));
menu5.addItem("成功案例分类", "");
var subMenu1 = menu5.addMenu(menu5.items[0]);
subMenu1.addItem("娱乐", "case/index.asp?classid=3");
subMenu1.addItem("剧院", "case/index.asp?classid=4");
subMenu1.addItem("国内体育场馆", "case/index.asp?classid=5");
subMenu1.addItem("国外体育场馆", "case/index.asp?classid=6");
subMenu1.addItem("内部通讯系统", "case/index.asp?classid=7");
subMenu1.addItem("活动", "case/index.asp?classid=8");
		mtDropDown.renderAll();
	}