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

	var menu7 = ms.addMenu(document.getElementById("menu7"));
		menu7.addItem("出境线路", "../Category_16/Index.aspx"); 
		menu7.addItem("签证须知", "../Category_11/Index.aspx"); 
		menu7.addItem("证件办理", "../Category_10/Index.aspx"); 

	mtDropDown.renderAll();
}