omega theme settings form alter

<?php
$themes = list_themes();
$theme = $form_state['build_info']['args'][0];
$settings_theme_info = $themes[$theme]->info;
$containers = array(
  '12' => '12 column grid (940 usable pixels)',
  '16' => '16 column grid (940 usable pixels)',
  '24' => '24 column grid (950 usable pixels)',
  '32' => '32 column grid (982 usable pixels)',
);

$form['omega_grid']['defaults']['omega_default_container_width'] = array(
  '#type' => 'select',
  '#title' => t('Default container width'),
  '#default_value' => omega_theme_get_setting('omega_default_container_width'),
  '#options' => $containers,
  '#weight' => -50,
  '#description' => t('This width is used for regions like $help, $messages and other non-important regions in page.tpl.php'),
);

$zones = $settings_theme_info['zones'];
$all_regions = $settings_theme_info['regions'];

foreach ($zones AS $zone => $regions) {
  $form['omega_grid'][$zone]['omega_'. $zone .'_container_width'] = array(
    '#type' => 'select',
    '#title' => t('Container width'),
    '#default_value' => omega_theme_get_setting('omega_'. $zone .'_container_width'),
    '#options' => $containers,
  );
}