function ecritfenetre(lurl){
   largeur=700;
  hauteur=500;
  var top=(screen.height-hauteur)/2;
  var left=(screen.width-largeur)/2;
  var params = "top=" + top + ",left=" + left + ",width=" + largeur + ",height=" + hauteur + ",resize=yes, scrollbars=yes";
fenetre = window.open(lurl,'',params);
fenetre.document.write(cadre);
fenetre.document.close();
}