function changeBack(id,ob01){
  try
  {
    if(document.all){
      document.all[id].style.backgroundColor=ob01;
    }else{
      if(document.layers){
       document.layers[id].bgColor=ob01;
      }else{
        document.getElementById(id).style.backgroundColor=ob01;
      }
    }
  }
  catch (err)
  {
    return;
  }
}