if (mtDropDown.isSupported()) {
  var ms = new mtDropDownSet(mtDropDown.direction.down, 0, 0, mtDropDown.reference.bottomLeft);
  var menu1 = ms.addMenu(document.getElementById("menu1"));
  menu1.addItem(" About Us ", "classinfo.aspx?classid=34");
  menu1.addItem(" Environment ", "classinfo.aspx?classid=35");
  menu1.addItem(" History ", "classinfo.aspx?classid=38");
  menu1.addItem(" Culture ", "classinfo.aspx?classid=39");
  menu1.addItem(" Organization ", "classinfo.aspx?classid=40");
  menu1.addItem(" Honors & Awards ", "classinfo.aspx?classid=41");

  var menu2 = ms.addMenu(document.getElementById("menu2"));
  menu2.addItem(" YWF Summarize of products ", "http://www.wgmotor.com/english/products.aspx?deep=1&classid=165");
  menu2.addItem(" YWF Series Axial Fans ", "http://www.wgmotor.com/english/products.aspx?deep=1&classid=293");
  menu2.addItem(" Accessories Of Axial Fan Motor ", "http://www.wgmotor.com/english/products.aspx?deep=1&classid=311");
  menu2.addItem(" YWF/WBL Series Centrifugal Fans ", "http://www.wgmotor.com/english/products.aspx?deep=1&classid=150");
  menu2.addItem(" YWF Series External Rotor Motors ", "http://www.wgmotor.com/english/products.aspx?deep=1&classid=149");
  menu2.addItem(" YZF Series Shaded Pole Motors ", "http://www.wgmotor.com/english/products.aspx?deep=1&classid=148");
  menu2.addItem(" YZF Summarize of products ", "http://www.wgmotor.com/english/products.aspx?deep=1&classid=299");
  menu2.addItem(" YZF Air Flow ", "http://www.wgmotor.com/english/products.aspx?deep=1&classid=309");
  menu2.addItem(" YZF With Pin Terminal Motors ", "http://www.wgmotor.com/english/products.aspx?deep=1&classid=229");
  menu2.addItem(" YCF Series Capacitance Motors ", "http://www.wgmotor.com/english/products.aspx?deep=1&classid=147");
  menu2.addItem(" ECM Summarize of products ", "http://www.wgmotor.com/english/products.aspx?deep=1&classid=297");
  menu2.addItem(" Accessories Of Shaded Pole Motor ", "http://www.wgmotor.com/english/products.aspx?deep=1&classid=307");
  menu2.addItem(" Energy-Saving Single-Phase Permancent-Magnetic Frequency-Converter Cooling Cabinet Fan ", "http://www.wgmotor.com/english/products.aspx?deep=1&classid=144");
  menu2.addItem(" YZF30 Series Shaded Pole Motors ", "http://www.wgmotor.com/english/products.aspx?deep=1&classid=145");
  menu2.addItem(" YGF Series Cross Flow Motors ", "http://www.wgmotor.com/english/products.aspx?deep=1&classid=146");
  menu2.addItem(" YJF Summarize of products ", "http://www.wgmotor.com/english/products.aspx?deep=1&classid=295");
  menu2.addItem(" YJF Series Shaded Pole Motors ", "http://www.wgmotor.com/english/products.aspx?deep=1&classid=142");
  
  var menu3 = ms.addMenu(document.getElementById("menu3"));
  menu3.addItem(" News Center  ", "news.aspx?deep=1&classid=45");

  var menu4 = ms.addMenu(document.getElementById("menu4"));
  menu4.addItem(" Downloads ", "news.aspx?deep=1&classid=42");
  menu4.addItem(" Service Network ", "classinfo.aspx?classid=46");
  menu4.addItem(" FAQ  ", "news.aspx?deep=1&classid=47");
  menu4.addItem(" User Feedback ", "server.aspx?deep=1&classid=48");
  menu4.addItem(" Agent ", "classinfoAgent.aspx?classid=63");

  mtDropDown.renderAll();
 }