Stuff

function theme_primary_menu_links($primary_links) {  global $user;  $output = '';  if (module_exists('nice_menus') && arg(0) != 'admin') {    $pid = variable_get('menu_primary_menu', 0);    if ($menu_tree = theme('nice_menu_tree', $pid)) {      if ($menu_tree['content']) {        // Hacking in a conditional signup tab here...        $register = $user->uid ? '' : '<li>'. l(t('Login/Register'), 'user') .'</li>';        $output .= '<ul class="nice-menu nice-menu-down" id="nice-menu-primary">'. $register . $menu_tree['content'] .'</ul>';      }    }  }  else {    $output .= theme('menu_links', $primary_links);  }  return $output;}