<script src="http://code.jquery.com/jquery-latest.js"></script>
  <script type = "text/javascript">

  $(document).ready(function() {
      $('#sort_list').bind('change', function () {
          var url = $(this).val();
          if (url != '') {
              window.location = url;
              $('#sort_list').find("option[value='"+url+"']").attr("selected", "selected");
          }
          return false;
      });
  });

  </script>