function open_zoom(nom_img){
titre="Zoom";
w = open("",'image','width=400,height=600,toolbar=no,scrollbars=yaes,resizable=no');
w.document.write(""+titre+"");
w.document.write("");
w.document.write("");
w.document.write("![]("+nom_img+") ");
w.document.write(" |
");
w.document.write("");
w.document.close();
}