if (mtDropDown.isSupported()) {

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

		var menu1 = ms.addMenu(document.getElementById("menu1"));
		menu1.addItem("公司简介","about.asp?id=113"); 
		menu1.addItem("资质证书","about.asp?id=114"); 
		menu1.addItem("企业文化","about.asp?id=115");	

		var menu2 = ms.addMenu(document.getElementById("menu2"));
		menu2.addItem("公司动态", "news.asp?ntype=2"); 
		menu2.addItem("行业新闻", "news.asp?ntype=1"); 
	
		var menu3 = ms.addMenu(document.getElementById("menu3"));
		menu3.addItem("CH-型电缆滑车", "product.asp?pro_type=41");
		menu3.addItem("新型电缆滑车", "product.asp?pro_type=42");
	        menu3.addItem("防爆电缆滑车", "product.asp?pro_type=43");
	       



		mtDropDown.renderAll();
	}