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

var	menu2	=	ms.addMenu(document.getElementById("mainmenu2"));
menu2.addItem("茶业动态",	"http://chaye.51rich.net/?action=text|chaye|1660|cn|3653|3653","_blank");
menu2.addItem("茶叶知识",	"?action=text|chaye|1660|cn|3660|3653","_blank");
menu2.addItem("茶文化",	"?action=text|chaye|1660|cn|3661|3653","_blank");
menu2.addItem(" 茶  具",	"?action=text|chaye|1660|cn|3662|3653","_blank");
var	menu4	=	ms.addMenu(document.getElementById("mainmenu4"));
menu4.addItem("茶叶市场",	"http://chaye.51rich.net/?action=text|chaye|1660|cn|3655|3655","_blank");
menu4.addItem("网上茶店",	"?action=text|chaye|1660|cn|3664|3655","_blank");
menu4.addItem("茶叶超市",	"?action=text|chaye|1660|cn|3665|3655","_blank");
menu4.addItem("供应信息",	"?action=text|chaye|1660|cn|3666|3655","_blank");
menu4.addItem("求购信息",	"?action=text|chaye|1660|cn|3667|3655","_blank");

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