I think you want the same as I do

SELECT * FROM gallery2 WHERE topic_id="16249" UNION SELECT * FROM gallery2 WHERE topic_id="616257" UNION SELECT * FROM gallery2 WHERE topic_id="223779" UNION SELECT * FROM gallery2 WHERE topic_id="1309302" UNION SELECT * FROM gallery2 WHERE topic_id="1046840" UNION SELECT * FROM gallery2 WHERE topic_id="1028487" UNION SELECT * FROM gallery2 WHERE topic_id="1570233" UNION SELECT * FROM gallery2 WHERE topic_id="367521" UNION SELECT * FROM gallery2 WHERE topic_id="1443355" UNION SELECT * FROM gallery2 WHERE topic_id="1420770" UNION SELECT * FROM gallery2 WHERE topic_id="1463109" UNION SELECT * FROM gallery2 WHERE topic_id="999314" UNION SELECT * FROM gallery2 WHERE topic_id="1116141" UNION SELECT * FROM gallery2 WHERE topic_id="1796922" UNION SELECT * FROM gallery2 WHERE topic_id="751119" UNION SELECT * FROM gallery2 WHERE topic_id="530278"