function contact(page,numpage) 
{ 
  largeur = 550; 
  hauteur = 500; 
  l = screen.width / 2 - largeur / 2; 
  h = screen.height / 2 - hauteur / 2; 
  application_=open(page,numpage,"width=" + largeur + ",height=" + hauteur +",resizable=no,scrollbars=yes,toolbar=no,,status=no,left=" + l + ",top=" + h); 
  application_.focus()
}