status = "";
function img_act(imgA, imgB){
if(document.images){
  if ((status == '')||(status != imgA)){
    document[imgA].src = eval(imgB + '.src');
    return;
  }
}
}
function img_change(imgA, imgB)
{
  if(document.images)
  {
    if ((status == '')||(status != imgA))
    {
      document[imgA].src = eval(imgB + '.src');
      if(status !='')
      {

        //document[status].src = eval(status + '_off.src');
      }
      status = imgA;
      return;
    }
  }
}