ion () {
                    return "images/minus.png";
                });

            }
            else {
                $(".img" + divId).attr("src", function () {
                    return "images/plus.png";
                });
            }
        }
    </script>


    <script type="text/javascript">
        //<![CDATA[

        $(document).ready(function () {
            $('img.screenshot').imgPreview({
                imgCSS: {
                    width: '500px'
                },
              