function OuvreExpo()
{
var y=(screen.Height-600)/2;
var x=(screen.Width-500)/2;
Fenetre = window.open("Pageexpo.htm","xx","height=600,width=500,resizable=no,screenX="+x+",left="+x+",screenY="+y+",top="+y);
f=Fenetre.document;
Fenetre.focus();
f.title="Katy Serra";
}