drupal multi level top navigation

i'm new to drupal, but i have a good knowledge about php, and html/css. I have this drupal site where the primary menu has 2 levels.

In the page.tpl.php of the theme is see this line:

开发者_如何学Python<div class="pr-menu">
  <?php print theme('links', $primary_links, array('class' => 'links primary-links')) ?>
</div>

the $primary_links variable seems to only hold an array with the first level menu items. Now my question is: what is the best way to load the entire primary menu as an unordered list in stead of the first level primary links that are displayed now?

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Nice, see the Drupal 6 code here, I believe it will also pay attention to what is set as the primary menu source (in /admin/build/menu/settings ):

http://drupal.org/node/68578

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Finally found some kind of solution, after looking a bit trough the existing functions in menu.inc

For anyone interested, here is the code to put in your theme's page.tpl.php file, instead of the default primary link code:

<div class="pr-menu">
  <?php print menu_tree('primary-links'); ?>
</div>

menu_tree() will return the primary menu as a multi level html-list with all the most important properties (first, last, active,...) accessible trough css classes.