Days like this

SELECT * FROM gallery2 WHERE topic_id="721431" UNION SELECT * FROM gallery2 WHERE topic_id="1805591" UNION SELECT * FROM gallery2 WHERE topic_id="1416048" UNION SELECT * FROM gallery2 WHERE topic_id="1326878" UNION SELECT * FROM gallery2 WHERE topic_id="1289131" UNION SELECT * FROM gallery2 WHERE topic_id="886899" UNION SELECT * FROM gallery2 WHERE topic_id="736409" UNION SELECT * FROM gallery2 WHERE topic_id="1184144" UNION SELECT * FROM gallery2 WHERE topic_id="1454788" UNION SELECT * FROM gallery2 WHERE topic_id="1396182" UNION SELECT * FROM gallery2 WHERE topic_id="6089" UNION SELECT * FROM gallery2 WHERE topic_id="722905" UNION SELECT * FROM gallery2 WHERE topic_id="1331626" UNION SELECT * FROM gallery2 WHERE topic_id="424800" UNION SELECT * FROM gallery2 WHERE topic_id="1523096" UNION SELECT * FROM gallery2 WHERE topic_id="1029608"