function focus(page)
{
var hauteur=400;
var largeur=600;
var top=(screen.height-hauteur)/2;
var left=(screen.width-largeur)/2;

var proprietes="top="+top+",left="+left+",width="+largeur+",height="+hauteur+",menubar=no,scrollbars=yes,statusbar=no,resizable=no";
var viewerpop = window.open(page,"",proprietes);
  if (!viewerpop.opener)viewerpop.opener=self;
  if (viewerpop.focus)viewerpop.focus();
}
function zoom(page)
{
var hauteur=400;
var largeur=425;
var top=(screen.height-hauteur)/2;
var left=(screen.width-largeur)/2;

var proprietes="top="+top+",left="+left+",width="+largeur+",height="+hauteur+",menubar=no,scrollbars=yes,statusbar=no,resizable=no";
var viewerpop = window.open(page,"",proprietes);
  if (!viewerpop.opener)viewerpop.opener=self;
  if (viewerpop.focus)viewerpop.focus();
}