//˵ַ,ҪӰ 

 if (mtDropDown.isSupported()) {

  var ms = new mtDropDownSet(mtDropDown.direction.down, 0, 5, mtDropDown.reference.bottomLeft);

var menu1 = ms.addMenu(document.getElementById("menu1"));
  menu1.addItem("公司介绍", "about.aspx");
  menu1.addItem("代理公司", "about-agency.aspx");
  
  var menu2 = ms.addMenu(document.getElementById("menu2"));
  menu2.addItem("航线说明", "desc.aspx"); 
  menu2.addItem("全程服务追踪", "service.aspx");  
  
  var menu3 = ms.addMenu(document.getElementById("menu3"));
  menu3.addItem("客户留言", "feedback.aspx"); 
  menu3.addItem("FAQ", "feedback-faq.aspx");
  mtDropDown.renderAll();
 }