Code for Primary and Secondary menu in Drupal 7

<div id="menu">
    <?php if (isset($secondary_menu)) { ?><?php print theme('links', $secondary_menu, array('class' => 'links', 'id' => 'subnavlist')); ?><?php } ?>
    <?php if (isset($main_menu)) { ?><?php print theme('links', $main_menu, array('class' => 'links', 'id' => 'navlist')) ?><?php } ?>
  </div>

For more information please visit:

http://drupal.org/update/themes/6/7