old_wind = ""
function afficher(url, w, h)
{
if (old_wind)
{
old_wind.close
}
doc = window.open (url,'auxi','toolbar=no,location=no,directories=no,status=yes,menubar=no,scrollbars=no,resizable=no,width='+w+',height='+h+',screenX='+w+',screenY='+h+',left=250,top=100')

old_wind = doc
old_wind.focus()
}


function fermer() {
  if (old_wind && old_wind.open && !old_wind.closed) old_wind.close();
  }