(function () {

  var special = jQuery.event.special,
        uid1 = 'D' + (+new Date()),
        uid2 = 'D' + (+new Date() + 1);

  special.scrollstart = {
    setup: function () {

      var timer,
                handler = function (evt) {

                  var _self = this,
                        _args = arguments;

                  if (timer) {
                    clearTimeout(timer);
                  } else {
                    evt.type = 'scrollstart';
                    jQuery.event.handle.apply(_self, _args);
                  }

                  timer = setTimeout(function () {
                    timer = null;
                  }, special.scrollstop.latency);

                };

      jQuery(this).bind('scroll', handler).data(uid1, handler);

    },
    teardown: function () {
      jQuery(this).unbind('scroll', jQuery(this).data(uid1));
    }
  };

  special.scrollstop = {
    latency: 300,
    setup: function () {

      var timer,
                    handler = function (evt) {

                      var _self = this,
                        _args = arguments;

                      if (timer) {
                        clearTimeout(timer);
                      }

                      timer = setTimeout(function () {

                        timer = null;
                        evt.type = 'scrollstop';
                        jQuery.event.handle.apply(_self, _args);

                      }, special.scrollstop.latency);

                    };

      jQuery(this).bind('scroll', handler).data(uid2, handler);

    },
    teardown: function () {
      jQuery(this).unbind('scroll', jQuery(this).data(uid2));
    }
  };

})();