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

var	menu3	=	ms.addMenu(document.getElementById("mainmenu3"));
menu3.addItem("产品介绍",	"/index.php/text/ayxr/1/cn/3678/3.html","");
menu3.addItem("应用领域",	"/index.php/text/ayxr/1/cn/3679/3.html","");
var	menu4	=	ms.addMenu(document.getElementById("mainmenu4"));
menu4.addItem("建造原理",	"/index.php/text/ayxr/1/cn/3680/4.html","");
menu4.addItem("建造设备",	"/index.php/text/ayxr/1/cn/3681/4.html","");
menu4.addItem("建造特点",	"/index.php/text/ayxr/1/cn/3682/4.html","");

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