function open_window(votre_page,hauteur,largeur){

// <script langage="javascript" src="../java/popup.js"></script>
// href=javascript:open_window('popup_con_ana.htm','180','538')

//var hauteur_popup=h;
//var largeur_popup=l;
var H = (screen.height - hauteur) / 2;
var L = (screen.width - largeur) / 2;
pop_up = window.open(votre_page,"Popup","status=no,scrollbars=yes,resizable=no,height="+hauteur+",width="+largeur+",top="+H+",left="+L);
}