konami code for jQuery

konami.js

(function ($) {
  $.fn.konami = function (callback, code) {
    code = code || "38,38,40,40,37,39,37,39,66,65,13";
    return this.each(function () {
      var kkeys = [];
      $(this).keydown(function (e) {
        kkeys.push(e.keyCode);
        if (kkeys.toString().indexOf(code) >= 0) {
          $(this).unbind('keydown', arguments.callee);
          callback(e);
        }
      }, true);
    });
  }
})(jQuery);