function MacInfo(){

       var locator =new ActiveXObject ("WbemScripting.SWbemLocator");

       var service = locator.ConnectServer(".");

       var properties = service.ExecQuery("Select * from Win32_NetworkAdapterConfiguration Where IPEnabled =True");

       var e =new Enumerator (properties);

       {

             var p = e.item();

            var mac = p.MACAddress;

            alert(mac)

       }

 }