Con quello script mi da questi errori:

Warning: move_uploaded_file(foto.gif): failed to open stream: Permission denied in /usr/local/home/htdocs/test/insert_foto.php on line 21

Warning: move_uploaded_file(): Unable to move '/tmp/phpPuj4f1' to 'foto.gif' in /usr/local/home/htdocs/test/insert_foto.php on line 21

Dove la linea 21 è questa:

if (move_uploaded_file($_FILES['foto']['tmp_name'], $uploaddir . $_FILES['foto']['name'])) {