$reslt = mysql_query("SELECT users.id FROM images,users WHERE images.user_id_fk = users.id AND images.id={$_GET['img']}");
$arry = mysql_fetch_assoc($reslt);
$reslt2 = mysql_query("SELECT images.id,images.image_name FROM images,users WHERE images.user_id_fk = users.id AND users.id={$arry[id]} ORDER BY RAND() LIMIT 4");
while($arry2 = mysql_fetch_assoc($reslt2))

SELECT images.id,images.image_name
FROM images,users
WHERE images.user_id_fk = users.id AND users.id={$arry[id]} AND images.id != {$_GET['img']}
ORDER BY RAND() LIMIT 4