[jQuery] treeview plugin - store option doesn't work to remember which items were clicked

[cfdvlpr]

Here's what I've got got in the head section of my HTML:

<script type="text/javascript">
        $(function(){
                $("#pageNav").Treeview({speed: "fast", collapsed: true, store:
true});
        });
</script>

The store option doesn't appear to work at all for me.
I do have the cookie plugin included.
I don't get any error messages in firebug.
I do notice that no cookies are being stored.
Has anyone got this to work?
Any ideas?