function affichage(nom)
{
  x = 800;		
  y = 600;	
  if (navigator.appName=="Microsoft Internet Explorer")
  	{
    ty = document.body.clientHeight;
    tx = document.body.clientWidth;
  	}
  else 
  	{
    ty = window.innerHeight;
    tx = window.innerWidth;
  	}
  ixe   = 0;
  igrec = 0;
  window.open (nom , '' + "affichage" + '','toolbar=no,location=no,directories=no,status=yes,menubar=no,scrollbars=yes,resizable=yes,height=' + y +',width=' + x + ',middle=' + ixe + ',middle=' + igrec +'');	
}