function ouvre(fenetre, photo, larg, haut)

{
  larg-=18;
  haut-=18;

  var options = 'width='+larg+',height='+haut+',resizable=0,menubar=0,copyhistory=0,directories=0,location=0,toolbar=0,scrollbars=0';
  var url = 'http://www.chez.com/pcery/popup.html?photo='+photo;
//  if (typeof(entretien)!='undefined'){entretien.close();}
  entretien = open(url, fenetre, options);

}