Maintain Gridview Scroll Position Inside div and Update Panel in asp.net

/////////////// JS

<script type="text/javascript">

            var scrollTop;

            Sys.WebForms.PageRequestManager.getInstance().add_beginRequest(BeginRequest);

            Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequest);

            function BeginRequest(sender, args) {

                var m = document.getElementById('TabledivGrid');

                scrollTop = m.scrollTop;

            }

            function EndRequest(sender, args) {

                var m = document.getElementById('TabledivGrid');

                m.scrollTop = scrollTop;

            }

        </script>