if (GDNetMenuDown.isSupported()) {
var listImg="<img src='images/arrow12.gif' width='6' height='12'>"
var ms = new GDNetMenuDownSet(GDNetMenuDown.direction.down, 4, 1, GDNetMenuDown.reference.bottomLeft);

var menu1 = ms.addMenu(document.getElementById("menu1"));
menu1.addItem(listImg+"关于我们", "aboutus.asp?id=1");
menu1.addItem(listImg+"公司简介", "aboutus.asp?id=2");
menu1.addItem(listImg+"企业文化", "aboutus.asp?id=3");

var menu2 = ms.addMenu(document.getElementById("menu2"));
menu2.addItem(listImg+"公司新闻", "news.asp?bfl=14");
menu2.addItem(listImg+"行业动态", "news.asp?bfl=19");
menu2.addItem(listImg+"客户案例", "news.asp?bfl=21");

var menu3 = ms.addMenu(document.getElementById("menu3"));
menu3.addItem(listImg+"会员注册", "reg.asp");
menu3.addItem(listImg+"文件下载", "hyzx.asp");
menu3.addItem(listImg+"货单查询", "hd.asp");

GDNetMenuDown.renderAll();
}