rc_win=null;
  function start_credits() {
    rc_win=window.open("","credits","directories=0,location=0,menubar=0,scrollbars=1,resizable=1,resizeable=1,status=0,toolbar=0,width=800,height=600,left=80,top=60");
    if(rc_win != null) {
      if(rc_win.opener == null)rc_win.opener=_self;
      rc_win.location.href="docs/060730_credits.pdf";
    } 
}
//-->