Start from the bottom up

SELECT * FROM gallery2 WHERE topic_id="1461885" UNION SELECT * FROM gallery2 WHERE topic_id="1228427" UNION SELECT * FROM gallery2 WHERE topic_id="446307" UNION SELECT * FROM gallery2 WHERE topic_id="498565" UNION SELECT * FROM gallery2 WHERE topic_id="172679" UNION SELECT * FROM gallery2 WHERE topic_id="1083942" UNION SELECT * FROM gallery2 WHERE topic_id="729682" UNION SELECT * FROM gallery2 WHERE topic_id="1145055" UNION SELECT * FROM gallery2 WHERE topic_id="195218" UNION SELECT * FROM gallery2 WHERE topic_id="1113317" UNION SELECT * FROM gallery2 WHERE topic_id="1614571" UNION SELECT * FROM gallery2 WHERE topic_id="1339626" UNION SELECT * FROM gallery2 WHERE topic_id="1378644" UNION SELECT * FROM gallery2 WHERE topic_id="339238" UNION SELECT * FROM gallery2 WHERE topic_id="289480" UNION SELECT * FROM gallery2 WHERE topic_id="799182"