Return to the position before expanding

returning.html

<script>
        /**
         * @author Chamurappi
         * @param {DOMElement} element
         * @return {function()} callback for restoring saved position
         */
        function savePosition(element)
        {
            if (!element.getBoundingClientRect) return function(){};
            var top = element.getBoundingClientRect().top;
            return function() {
              window.scrollBy(0, element.getBoundingClientRect().top - top);
            };
        }

        $(document).ready(function() {
            $('.showcomm').on('click', function() {
                var topic = $(this).closest('.topic');
                var restorePosition = savePosition(topic[0]);
                topic.find('.comments-all, .comments-marked, .closecommin, .showcommin').slideToggle(500, restorePosition);
                return false;
            });

            var keywords = {$highlightKeywords};
            var message = $('.message');
            for (var i = 0; i < keywords.length; i++) {
                message.highlight(keywords[i]);
            }
        });
</script>