No comparability with parallel module

/**
 * Implementation of hook_theme_registry_alter().
 *
 * Make csstidy's page preprocess function run *after* everything else's,
 * so that a theme can't call drupal_get_js() and mess everything up.
 *
 * @param &$theme_registry
 *   The entire cache of theme registry information, post-processing.
 */
function csstidy_theme_registry_alter(&$theme_registry) {
  if (isset($theme_registry['page'])) {
    // If csstidy's preprocess function is there already, remove it.
    if ($key = array_search('csstidy_preprocess_page', $theme_registry['page']['preprocess functions'])) {
      unset($theme_registry['page']['preprocess functions'][$key]);
    }
    // Now tack it on at the end so it runs after everything else.
    $theme_registry['page']['preprocess functions'][] = 'csstidy_preprocess_page';

    // Move parallel's preprocess function after ours.
    if ($key = array_search('parallel_preprocess_page', $theme_registry['page']['preprocess functions'])) {
      unset($theme_registry['page']['preprocess functions'][$key]);
      $theme_registry['page']['preprocess functions'][] = 'parallel_preprocess_page';
    }

  }
}