# menu with main navigation
$mainMenu = menu_get_item(61);

print "<ul id=\"nav\">";

  # for each item in main navigation menu do
  foreach ($mainMenu['children'] as $mainMenuItem) {

    # print UL for each menu item with links
    $subMenu = menu_get_item($mainMenuItem);
    print "<li class=\"mainlink\">" . $subMenu['title'] . "</li>";

    print "<ul id='" . strtolower($subMenu['title']) . "'>";
      foreach ($subMenu['children'] as $subMenuItem) {
        print "<li>" . menu_item_link($subMenuItem) . "</li>";
      }
    print "</ul>";
  }

# close ul#nav
print "</ul>";