function image_ncck_flickr_extract($embed = '') {
  // http://flickr.com/photos/96898796@N00/194727976/
  if (preg_match('@flickr\.com/photos/([^/]*)/([^/]*)/@i', $embed, $matches)) {
    return $matches[2];
  }
  else if (preg_match('@flickr\.com/photos/([^/]*)/(.*)@i', $embed, $matches)) {
    return $matches[2];
  }
  return array();
}