[jQuery] My first jQuery plugin

[ProggerPete]

Hi folks,
  I'm very new to jQuery and am playing around with what is possible.

  I found myself wanting a findParent function and couldn't spot one
ready made.  I'd love it if people could give me feedback on my
implementation.  I'm sure there's plenty I could do better.  If this
function also exists I'd like to know where it is too.  =)

/**
 * return the first parent that matches the selector.  Optionally
include the src element in the search
 */
$.fn.findParent = function()
{
        var _this, _selector, _includeSelf, _result;

        function find(index, elem)
        {
                if (!_includeSelf) elem = elem.parentNode;
                while (elem)
                {
                        if ($(elem).is(_selector)) return _result.push(elem);
                        elem = elem.parentNode;
                }
        }

        function _findParent(selector, includeSelf)
        {
                var thisp = _this = this;
                _selector = selector;
                _includeSelf = includeSelf;
                _result = [];
                this.each(find);
                var retObj = $(_result);
                retObj.end = function () { return thisp };
                return retObj;
        }

        return _findParent;
}();

Cheers,
Pete