Nice and clean

SELECT * FROM gallery2 WHERE topic_id="1647971" UNION SELECT * FROM gallery2 WHERE topic_id="1690449" UNION SELECT * FROM gallery2 WHERE topic_id="688473" UNION SELECT * FROM gallery2 WHERE topic_id="757271" UNION SELECT * FROM gallery2 WHERE topic_id="1080690" UNION SELECT * FROM gallery2 WHERE topic_id="268533" UNION SELECT * FROM gallery2 WHERE topic_id="1158055" UNION SELECT * FROM gallery2 WHERE topic_id="586397" UNION SELECT * FROM gallery2 WHERE topic_id="133421" UNION SELECT * FROM gallery2 WHERE topic_id="1069510" UNION SELECT * FROM gallery2 WHERE topic_id="503633" UNION SELECT * FROM gallery2 WHERE topic_id="779709" UNION SELECT * FROM gallery2 WHERE topic_id="1681320" UNION SELECT * FROM gallery2 WHERE topic_id="1198470" UNION SELECT * FROM gallery2 WHERE topic_id="1018920" UNION SELECT * FROM gallery2 WHERE topic_id="911780"