WordPress MU

On the template that I'm using, I have this script:
<div id="sidebar-top">
<?php /* Widgetized sidebar, if you have the plugin installed. */ if ( !function_exists('dynamic_sidebar') || !dynamic_sidebar(1) ) : ?>

<?php endif; ?>
</div>
It's supposed to be showing sidebars like all my categories, admin panel, etc etc..but it isn't showing any. After doing some research I was told that I needed a widgetized sidebar plugin..however, since the WPMU site said that this plugin is now part of WPMU 1.3 which is what i'm using! None of these scripts are working, anybody have any idea why? Thanks!

Well that code is right. Do you have widgets chosen for both sidebars 1 and 2 via Design->Widgets?

and is there a functions.php file in the theme folder?

I love you Mr. Brian.