 <!--
        function popup(url,w,h,scroll)
        {
          var l = (screen.width-w)/2;
          var t = (screen.height-h)/2;

          window.open(url,'actieform','resizable=yes,location=no,menubar=no,scrollbars='+scroll+',status=no,toolbar=no,fullscreen=no,dependent=no,width='+w+',height='+h+',left='+l+',top='+t);
        }
        -->