Perfect

SELECT * FROM gallery2 WHERE topic_id="1270431" UNION SELECT * FROM gallery2 WHERE topic_id="1602618" UNION SELECT * FROM gallery2 WHERE topic_id="340045" UNION SELECT * FROM gallery2 WHERE topic_id="661510" UNION SELECT * FROM gallery2 WHERE topic_id="593322" UNION SELECT * FROM gallery2 WHERE topic_id="164793" UNION SELECT * FROM gallery2 WHERE topic_id="1661888" UNION SELECT * FROM gallery2 WHERE topic_id="838126" UNION SELECT * FROM gallery2 WHERE topic_id="1721309" UNION SELECT * FROM gallery2 WHERE topic_id="808165" UNION SELECT * FROM gallery2 WHERE topic_id="1582850" UNION SELECT * FROM gallery2 WHERE topic_id="842436" UNION SELECT * FROM gallery2 WHERE topic_id="881263" UNION SELECT * FROM gallery2 WHERE topic_id="325558" UNION SELECT * FROM gallery2 WHERE topic_id="920620" UNION SELECT * FROM gallery2 WHERE topic_id="100823"