if (mtDropDown.isSupported()) {
var ms = new mtDropDownSet(mtDropDown.direction.down, 3, 6, mtDropDown.reference.bottomLeft);

var menu1 = ms.addMenu(document.getElementById("menu1"));
menu1.addItem("瀚海建材", "http://www.cementcn.com/chinese/Customer_case.asp");



mtDropDown.renderAll();
}