if (mtDropDown.isSupported()) {
  var ms = new mtDropDownSet(mtDropDown.direction.down,0, 0, mtDropDown.reference.bottomLeft);
  var menu1 = ms.addMenu(document.getElementById("menu1"));
menu1.addItem("最新推出","product88.html");  
menu1.addItem("IBM服务器","product01.html");
menu1.addItem("HP服务器","product02.html");
menu1.addItem("网络产品","product03.html");
menu1.addItem("商用PC","product04.html");
menu1.addItem("华为-3COM","product05.html");
  
  var menu2 = ms.addMenu(document.getElementById("menu2"));
menu2.addItem("综 合 布 线　","basic88.html");
menu2.addItem("光 纤 工 程　","basic07.html");
menu2.addItem("无 线 网 络　","basic11.html");
menu2.addItem("机 房 建 设　","basic09.html");
menu2.addItem("防 雷 工 程　","basic10.html");
  
  var menu3 = ms.addMenu(document.getElementById("menu3"));
menu3.addItem("服务器系统","upside88.html");
menu3.addItem("网络安全","upside04.html");   
menu3.addItem("网络管理","upside05.html");
menu3.addItem("网络防病毒","upside06.html");
menu3.addItem("交换及路由","upside07.html");
  var menu4 = ms.addMenu(document.getElementById("menu4"));
menu4.addItem("公 司 简 介","company88.html");
menu4.addItem("经 营 资 质","company01.html");
menu4.addItem("成 功 案 例","company05.html");
menu4.addItem("合 作 伙 伴","company02.html");
menu4.addItem("诚 聘 英 才","company03.html");
menu4.addItem("核 心 理 念","company04.html");

  mtDropDown.renderAll();
 }