ramzes,
if (file_exists($_SERVER['DOCUMENT_ROOT'].'/files/users/photo/' . $user['id'] . '_small.jpg'))
echo '<a href="files/users/photo/' . $user['id'] . '.jpg"><img src="files/users/photo/' . $user['id'] . '_small.jpg" alt="' . $user['name'] . '" border="0" /></a>';Тоже самое
