update modals demo code

javascript.html

@@ -207,8 +207,8 @@ $('#myModal').on('show.bs.modal', function (e) {
           ...
         </div>
         <div class="modal-footer">
-          <a href="#" class="btn">Close</a>
-          <a href="#" class="btn btn-primary">Save changes</a>
+          <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
+          <button type="button" class="btn btn-primary">Save changes</button>
         </div>
       </div><!-- /.modal-content -->
     </div><!-- /.modal-dialog -->