Rails spinoffs - Aug 2005 - how do I report the list order of a drag and drop list back?

Hello,

I try to report the new order of a list back to the server, after the
drag & drop is done, but I am not sure how to do it.

My ids are underscore separated like this:

<ul class="sortablelist" id="ja">
  <li class="green" id="item_1">Item 1</li>
...
</ul>

I define the sortable like this:

Sortable.create("ja",
    {
        containment:["ja","jb"],
        onUpdate:function(){
            new Ajax.Updater(''list-info'',?
                             ''/dnd/sortorder.py'')
        }
    }
    );


there is a second ul, with the id="jb"

I get post request back to /dnd/sortorder.py, but without the new order.
Do I have to add Sortable.serialize(''ja'') to the
Ajax.Updater(...)?
How?


	Thanks in advance
	Joerg