[support] horizontal cascading menu

I'm running into a problem trying to get a menu block to display horizontally. AFAIK the menu items are supposed to come out as an unordered list, but I can't figure out how to override the css properly to make them display across instead of up and down.

This code in page.tpl.php seems to fix that:

<?php if (isset($primary_links)) : ?> <?php print theme('links', $primary_links, array('class' => 'links primary-links')) ?> <?php endif; ?>

However when I then add child links to some of these menu items they do not display. FWIW I'd like those links to behave like they do on the left sidebar by default, cascading downwards after the parent link has been clicked.

Thanks.

Marty