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

var	menu5	=	ms.addMenu(document.getElementById("mainmenu5"));
menu5.addItem("炼化行业",	"/userlist/nyfbdj/text-16917.html","");
menu5.addItem("钢铁行业",	"/userlist/nyfbdj/text-16918.html","");
menu5.addItem("煤化工行业",	"/userlist/nyfbdj/text-16919.html","");
menu5.addItem("多晶硅行业",	"/userlist/nyfbdj/text-16920.html","");
menu5.addItem("煤矿通风机行业",	"/userlist/nyfbdj/text-16921.html","");

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