function image_ncck_flickr_extract($embed = '') {
  // http://flickr.com/photos/96898796@N00/194727976/
  preg_match('@flickr\.com/photos/[^/]*/(\d*)@i', $embed, $matches);
  
  if($matches[1] != '') {
    return $matches[1];
  }
  return array();
}