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

var	menu2	=	ms.addMenu(document.getElementById("mainmenu2"));
menu2.addItem("人力资源",	"?action=text|wlky|2116|cn|4157|4156","_blank");
menu2.addItem("求才信息",	"?action=text|wlky|2116|cn|4158|4156","_blank");
var	menu4	=	ms.addMenu(document.getElementById("mainmenu4"));
menu4.addItem("航空服务报价",	"?action=text|wlky|2116|cn|4160|4151","_blank");
menu4.addItem("铁路服务报价",	"?action=text|wlky|2116|cn|4161|4151","_blank");

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