Something

<?
  echo "<html><head><link rel='stylesheet' type='text/css' href='pictures.css' /></head><body>";

    function scandir_recursive($path)
      {
      if (!is_dir($path)) return 0;
      $list=array();
      $directory = opendir("$path");
      while ($file= readdir($directory)) 
        {
             if (($file<>".")&&($file<>"..")) 
              {  
                 $f=$path."/".$file;
      $f=preg_replace('/(\/){2,}/','/',$f);
      if(is_file($f)) $list[]=$f;             
      if(is_dir($f))
      $list = array_merge($list ,scandir_recursive($f));                             
              }    
         }
      closedir($directory);  
      return $list ;
      };

      scandir_recursive("pictures");
      foreach($list as $l){echo $l . '<br />';};

  echo "</body></html>";
?>