im using jquery sortable on a list to move the elements around. It works fine to start but I also have an ajax panel on my page that can add new items to the list. Once ajax sends new elements to the list I can no-longer sort it. I have this call:

```
$("#MainContent_previewlist").sortable({
            update: function (event, ui) { }
        });

```

I am not familiar with javascript. Do I need to call some event to get jquery to evaluate the new list after ajax?