function ssn(ms_obj, ms_type, ms_id)
 {
  if (ms_type==1)
   {
ms_obj.style.background='url(/design/main/pic/bt_ng_02.gif) repeat-x'; 
document.getElementById('b1'+ms_id).src='/design/main/pic/bt_ng_01.gif'; 
document.getElementById('b2'+ms_id).src='/design/main/pic/bt_ng_03.gif'; 
   }
    else
   {
ms_obj.style.background='url(/design/main/pic/bt_ot_02.gif) repeat-x'; 
document.getElementById('b1'+ms_id).src='/design/main/pic/bt_ot_01.gif'; 
document.getElementById('b2'+ms_id).src='/design/main/pic/bt_ot_03.gif'; 
   }
 }