if (mtDropDown.isSupported()) 
		{
			var ms = new mtDropDownSet(mtDropDown.direction.down, -21, 5, mtDropDown.reference.bottomLeft);

var	menu1	=	ms.addMenu(document.getElementById("mainmenu1"));
menu1.addItem("==企业介绍==","about.asp","_self");
menu1.addItem("==公司历程==","about3.asp","_self");
menu1.addItem("==公司业绩==","about4.asp","_self");
menu1.addItem("==企业文化==","about5.asp","_self");



var	menu4	=	ms.addMenu(document.getElementById("mainmenu4"));
menu4.addItem("==资料下载==","ser.asp","_self");
menu4.addItem("==故障维护==","ser2.asp","_self");
menu4.addItem("==售后承诺==","ser3.asp","_self");

var	menu5	=	ms.addMenu(document.getElementById("mainmenu5"));
menu5.addItem("==人才理念==","job2.asp","_self");
menu5.addItem("==人才招聘==","job.asp","_self");

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