if (mtDropDown.isSupported()) {
  var ms = new mtDropDownSet(mtDropDown.direction.down, 0, 0, mtDropDown.reference.bottomLeft);
 
  
  var menu1 = ms.addMenu(document.getElementById("menu1"));
   
  menu1.addItem("  保健品类", "pro.asp?cid=18");
  
  menu1.addItem("  青稞酒类", "pro.asp?cid=19");

  


  mtDropDown.renderAll();
 }