ini_set('include_path', '.');
  header('Content-Type: text/javascript');

  if(!empty($_GET['__args__']))
  {
    $files = (array)explode('|',$_GET['__args__']);
    foreach($files as $file)
    {
      if(isValidFile($file))
      {
        readfile($file);
        echo "\n";
      }
    }
  }

  function isValidFile($file)
  {
    // add whatever logic here you'd like
    return substr($file, -3) == '.js';
  }