if (mtDropDown.isSupported()) {
  var ms = new mtDropDownSet(mtDropDown.direction.down,10, 0, mtDropDown.reference.bottomLeft);
    var menu1 = ms.addMenu(document.getElementById("menu1"));
  menu1.addItem("&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;油画&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;", "youhua.asp");
  menu1.addItem("&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;咖啡&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;", "kafeiwu.asp");
  menu1.addItem("&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;简餐&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;", "jianchan.asp");
  mtDropDown.renderAll();
 }