Checkbox Range Selection Update

Just a little update to my checkbox range selection jQuery plugin to allow chaining.  I'd forgotten to return 'this' at the end of the function.  Here's the full source, including the mod:

(function($) {
  $.fn.enableCheckboxRangeSelection = function() {
    var lastCheckbox = null;
    var $spec = this;
    $spec.bind("click", function(e) {
      if (lastCheckbox != null && e.shiftKey) {
        $spec.slice(
          Math.min($spec.index(lastCheckbox), $spec.index(e.target)),
          Math.max($spec.index(lastCheckbox), $spec.index(e.target)) + 1
        ).attr({checked: e.target.checked ? "checked" : ""});
      }
      lastCheckbox = e.target;
    });
    return $spec;
  };
})(jQuery);

You can check the project page as well, for full history and updates.