if (mtDropDown.isSupported()) {
  var ms = new mtDropDownSet(mtDropDown.direction.down, 0, 0, mtDropDown.reference.bottomLeft);

  var menu1 = ms.addMenu(document.getElementById("menu1"));
  menu1.addItem("&nbsp;&nbsp;国内酒店&nbsp;&nbsp;", "/Hotel/Default.asp");
  menu1.addItem("&nbsp;&nbsp;国际及港澳酒店&nbsp;&nbsp;", "/eHotel/Default.asp");
  
  //var menu2 = ms.addMenu(document.getElementById("menu2"));
  //menu2.addItem("&nbsp;&nbsp;国际及港澳度假&nbsp;&nbsp;", "/FreeTravel/Default.asp");
  //menu2.addItem("&nbsp;&nbsp;国内机+酒&nbsp;&nbsp;", "/HkTravel/Default.asp");

  var menu3 = ms.addMenu(document.getElementById("menu3"));
  menu3.addItem("&nbsp;&nbsp;国内机票&nbsp;&nbsp;", "/cAirTicket/Default.asp");
  menu3.addItem("&nbsp;&nbsp;国际机票&nbsp;&nbsp;", "/eAirTicket/Default.asp");
  mtDropDown.renderAll();
 }