if (mtDropDown.isSupported()) 
		{
			var ms = new mtDropDownSet(mtDropDown.direction.down, 0, 0, mtDropDown.reference.bottomLeft);

var	menu2	=	ms.addMenu(document.getElementById("mainmenu2"));
menu2.addItem("企业为什么要建网站？",	"?action=text|admin|657|cn|28|4","_blank");
menu2.addItem("互联网与企业",	"?action=text|admin|657|cn|23|4","_blank");
menu2.addItem("域名相关知识介绍",	"?action=text|admin|657|cn|24|4","_blank");
menu2.addItem("电子商务ABC",	"?action=text|admin|657|cn|25|4","_blank");
menu2.addItem("网站维护",	"?action=text|admin|657|cn|26|4","_blank");
menu2.addItem("你问我答",	"?action=text|admin|657|cn|27|4","_blank");
var	menu3	=	ms.addMenu(document.getElementById("mainmenu3"));
menu3.addItem("公司历程",	"?action=text|admin|657|cn|14|1","_blank");
menu3.addItem("公司文化",	"?action=text|admin|657|cn|16|1","_blank");

			mtDropDown.renderAll();
		}
		//初始菜单
		window.onload = init;