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

var	menu4	=	ms.addMenu(document.getElementById("mainmenu4"));
menu4.addItem("百度竟排",	"?action=text|admin|414|cn|293|281","_blank");
menu4.addItem("Google排名原理",	"?action=text|admin|414|cn|294|281","_blank");
menu4.addItem("搜狐网推广",	"?action=text|admin|414|cn|295|281","_blank");
menu4.addItem("认识搜索引擎优化",	"?action=text|admin|414|cn|296|281","_blank");
menu4.addItem("网站搜索免费登陆口",	"?action=text|admin|414|cn|297|281","_blank");

			mtDropDown.renderAll();
		}
		//��ʼ�˵�
		window.onload = init;