var win2;
function ouvrir(url_fichier,nom_fen,larg,haut)
{


        if (win2 == null || win2.closed)
                win2=open(url_fichier,nom_fen,"toolbar=NO,directories=NO,location=NO,menubar=NO,resizable=YES,scrollbars=YES,status=NO,alwaysRaised=yes top=0, left=0,width="+larg+",height="+haut);

        else
        {
                win2.close();
                win2=open(url_fichier,nom_fen,"toolbar=NO,directories=NO,location=NO,menubar=NO,resizable=YES,scrollbars=YES,status=NO,alwaysRaised=yes top=0, left=0,width="+larg+",height="+haut);
        }

        win2.focus();
}