function change(img,act,windowstatus) 
{ if (document.images) 
  { if (act=="on")  
    { document [img].src = eval(img+'_on.src'); 
      if (windowstatus)
        { window.status=windowstatus; }
    } 
    else
    { document [img].src = eval(img+'.src'); 
      window.status='';
    } 
  } 
}