if (mtDropDown.isSupported()) {
  var ms = new mtDropDownSet(mtDropDown.direction.down, 0, 0, mtDropDown.reference.bottomLeft);
  var menu1 = ms.addMenu(document.getElementById("menu1"));

  menu1.addItem("公司简介", "about.asp?id=7");

  menu1.addItem("组织架构", "about.asp?id=3");

  menu1.addItem("质量体系", "about.asp?id=2");

  
  var menu2 = ms.addMenu(document.getElementById("menu2"));

  menu2.addItem("字符点阵液晶模块", "Pro.asp?id=1");

  menu2.addItem("图像点阵液晶模块", "Pro.asp?id=2");

  menu2.addItem("COG/TAB液晶模块", "Pro.asp?id=3");

  
  var menu3 = ms.addMenu(document.getElementById("menu3"));

  menu3.addItem("相关知识", "Support.asp?id=1");

  menu3.addItem("产品应用", "Support.asp?id=2");

  
  var menu4 = ms.addMenu(document.getElementById("menu4"));
  menu4.addItem("  招聘信息", "Job.asp");
  
  mtDropDown.renderAll();
 }