Event.onReady(function() {

  $$("a.help").each(function(element) {
    Event.observe(element, "click", function(event) {
      Event.stop(event);
      var win = window.open(
        element.readAttribute("href"),
        'help',
        'width=800,height=500,toolbar=yes,location=yes,directories=yes,status=no,menubar=yes,scrollbars=yes,copyhistory=no,resizable=yes'
      );
      win.focus();
    });
  });
});