if (mtDropDown.isSupported()) {

		var ms = new mtDropDownSet(mtDropDown.direction.down, 0, 0, mtDropDown.reference.bottomLeft);		
		
		var menu2 = ms.addMenu(document.getElementById("menu2"));
	
		
		menu2.addItem("公司介绍  ", "introduction.php?item_b=1");
		menu2.addItem("服务理念  ", "introduction.php?item_b=2");
		menu2.addItem("联系方式  ", "introduction.php?item_b=3");
	
		
		
		var menu3 = ms.addMenu(document.getElementById("menu3"));
	  
		menu3.addItem("  电脑服务项目", "services.php?item_b=4");
		menu3.addItem("  家电服务项目", "services.php?item_b=21");
		menu3.addItem("  数码服务项目", "services.php?item_b=22");
        menu3.addItem("  其它服务项目", "services.php?item_b=23");
		

		var menu4 = ms.addMenu(document.getElementById("menu4"));
		  
		menu4.addItem(" 出行服务", "addservices.php?item_b=7");
		menu4.addItem(" 数据存储中心", "addservices.php?item_b=8");
		menu4.addItem(" 便利店", "addservices.php?item_b=9");
		
	
				
		
		
		
		
		
		
	
		

		

		mtDropDown.renderAll();
	}