Warning: require_once(lib/db.php) [function.require-once]: failed to open stream: No such file or directory in /web/media/index.php on line 2

Fatal error: require_once() [function.require]: Failed opening required 'lib/db.php' (include_path='.:/usr/local/apache2/php/lib/php2') in /web/media/index.php on line 2