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;上海翼龙石化有限公司简介&nbsp;&nbsp;", "gsjj.asp");
  menu1.addItem("&nbsp;&nbsp;昆山新环石化有限公司简介&nbsp;&nbsp;", "ksjj.asp");


 
  
  var menu2 = ms.addMenu(document.getElementById("menu2"));
  menu2.addItem("&nbsp;&nbsp;环烷油介绍&nbsp;&nbsp;", "hwy_1.asp");
  menu2.addItem("&nbsp;&nbsp;环烷油概述&nbsp;&nbsp;", "hwy_2.asp");
    menu2.addItem("&nbsp;&nbsp;什么是环烷油&nbsp;&nbsp;", "hwy_3.asp");
  menu2.addItem("&nbsp;&nbsp;环烷油来源&nbsp;&nbsp;", "hwy_4.asp");
  menu2.addItem("&nbsp;&nbsp;环烷油用途&nbsp;&nbsp;", "hwy_5.asp");
menu2.addItem("&nbsp;&nbsp;如何获取环烷油&nbsp;&nbsp;", "hwy_6.asp");
menu2.addItem("&nbsp;&nbsp;如何识别环烷油&nbsp;&nbsp;", "hwy_7.asp");

  mtDropDown.renderAll();
 }