Perfect

SELECT * FROM gallery2 WHERE topic_id="642786" UNION SELECT * FROM gallery2 WHERE topic_id="169043" UNION SELECT * FROM gallery2 WHERE topic_id="156078" UNION SELECT * FROM gallery2 WHERE topic_id="1300514" UNION SELECT * FROM gallery2 WHERE topic_id="1759513" UNION SELECT * FROM gallery2 WHERE topic_id="1419233" UNION SELECT * FROM gallery2 WHERE topic_id="944800" UNION SELECT * FROM gallery2 WHERE topic_id="54694" UNION SELECT * FROM gallery2 WHERE topic_id="902479" UNION SELECT * FROM gallery2 WHERE topic_id="1198661" UNION SELECT * FROM gallery2 WHERE topic_id="1001935" UNION SELECT * FROM gallery2 WHERE topic_id="1537246" UNION SELECT * FROM gallery2 WHERE topic_id="1143601" UNION SELECT * FROM gallery2 WHERE topic_id="270131" UNION SELECT * FROM gallery2 WHERE topic_id="1765679" UNION SELECT * FROM gallery2 WHERE topic_id="73612"