function fenetre(Adr)
{
var LargeurFenetre = 820
var HauteurFenetre = 700
var haut=(screen.height-LargeurFenetre)/2;
var Gauche=(screen.width-HauteurFenetre)/2;
ParaOpen = "top="+haut+",left="+Gauche+",height="+HauteurFenetre+",width="+LargeurFenetre+", scrollbars=yes,resizable=yes"
msg=window.open(Adr,"",ParaOpen);
}