if (mtDropDown.isSupported()) {

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

		var menu1 = ms.addMenu(document.getElementById("menu1"));
		menu1.addItem("- 公司介绍","About.asp?Title=公司介绍"); // send no URL if nothing should happen onclick
		menu1.addItem("- 生产设备","About.asp?Title=生产设备");
	
//第二菜单
		var menu2 = ms.addMenu(document.getElementById("menu2"));
		menu2.addItem("- 回转支承", "Product.asp?BigClassName=回转支承"); 
		menu2.addItem("- 整体式减速回转机", "Product.asp?BigClassName=整体式减速回转机"); // send no URL if nothing should happen onclick
		menu2.addItem("- 挖掘机底盘件", "Product.asp?BigClassName=挖掘机底盘件"); 
		
	
		mtDropDown.renderAll();
	}