function getThumbnailsList()
{
  $files = array();
  if($dir = scandir($this->thumbnailspath)){
    foreach($dir as $file){
      if(is_file($this->thumbnailspath.$file) && 
         strtolower(substr($file, -4)) == '.jpg'){
        $files[] = substr($file, 0, -4);
      }
    }
  }
  return $files;
}