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

var	menu3	=	ms.addMenu(document.getElementById("mainmenu3"));
menu3.addItem("厨房设备",	"http://www.hb-cj.com/index.php?action=list|huanbei|1|cn|4023|4023&sortid=3611","");
menu3.addItem("冷库工程",	"http://www.hb-cj.com/index.php?action=list|huanbei|1|cn|4023|4023&sortid=3610","");
menu3.addItem("空气热泵",	"http://www.hb-cj.com/index.php?action=list|huanbei|1|cn|4023|4023&sortid=6854","");
menu3.addItem("净化设备",	"http://www.hb-cj.com/index.php?action=list|huanbei|1|cn|4023|4023&sortid=6922","");

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