I'm trying to populate a hidden <div> with an AJAX call, and then show that <div> with a scriptaculous effect. The AJAX works, but the <div> appears suddenly without the slide effect. Thanks for any help.

Here's the relevant HTML:

<div id="admin_populated_user_form" style="display: none">
<div>
</div>
</div>

And the Javascript:

var sel = $('user_sel');
sel.onchange = function () {
    var val = $F('user_sel');
    if( val != 0 ) {
        var ajax = new Ajax.Updater(
            'admin_populated_user_form',
            '/admin/users/fetch_user',
            {  method: 'get',
               parameters: 'user=' + val
            }
        );

        Effect.toggle( 'admin_populated_user_form', 'slide' );
    }
}



Thanks for any help.