'fieldset',
      '#collapsible' => TRUE,
      '#collapsed' => isset($fb_app->label),
      '#title' => t('Facebook profile tabs'),
      '#description' => t('Settings which apply to profile tabs.',
                          array('!url' => 'http://developers.facebook.com/docs/guides/canvas/#tabs')),
    );
    // Override themes
    $themes = system_get_info('theme');
    ksort($themes);
    $theme_options[0] = t('System default');
    foreach ($themes as $key => $theme) {
      $theme_options[$key] = $theme['name'];
    }
    $form['fb_app_data']['fb_tab']['custom_theme'] = array(
      '#type' => 'select',
      '#title' => t('Theme for profile tabs'),
      '#description' => t('Choose a theme designed to return FBML specifically for the 520 pixel wide space allocated to tabs.  
Note that if your tab path is a menu callback which returns FBML, this setting is ignored.'),
      '#options' => $theme_options,
      '#required' => TRUE,
      '#default_value' => $config['custom_theme'],
    );
    // Properties: http://developers.facebook.com/docs/appproperties
    $form['fb_app_data']['fb_tab']['tab_default_name'] = array(
      '#type' => 'textfield',
      '#title' => 'Tab name',
      '#default_value' => $config['tab_default_name'],
      '#description' => t('A very short title.'),
    );
    $form['fb_app_data']['fb_tab']['profile_tab_url'] = array(
      '#type' => 'textfield',
      '#title' => 'Path',
      '#default_value' => $config['profile_tab_url'],
      '#description' => t('Recommended value is %tab_path.  You may choose another if you have defined a custom menu item or view.', array('%tab_path' => FB_TAB_PATH_VIEW)),
    );
    /* XXX is this used by facebook?
    $form['fb_app_data']['fb_tab']['edit_url'] = array(
      '#type' => 'textfield',
      '#title' => 'Edit URL',
      '#default_value' => $config['edit_url'],
      '#description' => t('Recommended value is %edit_url.', array(
                            '%edit_url' => url(FB_TAB_PATH_FORM, array('absolute'=> TRUE)))),
    );
    $form['fb_app_data']['fb_tab']['edit_url']['#description'] .= '
' . t('Note that this field is apparently unused by facebook.');
    */
  }
}