Try some

SELECT * FROM gallery2 WHERE topic_id="255733" UNION SELECT * FROM gallery2 WHERE topic_id="1015107" UNION SELECT * FROM gallery2 WHERE topic_id="947048" UNION SELECT * FROM gallery2 WHERE topic_id="1694544" UNION SELECT * FROM gallery2 WHERE topic_id="1348205" UNION SELECT * FROM gallery2 WHERE topic_id="1541819" UNION SELECT * FROM gallery2 WHERE topic_id="1436592" UNION SELECT * FROM gallery2 WHERE topic_id="2011" UNION SELECT * FROM gallery2 WHERE topic_id="551379" UNION SELECT * FROM gallery2 WHERE topic_id="1200566" UNION SELECT * FROM gallery2 WHERE topic_id="500643" UNION SELECT * FROM gallery2 WHERE topic_id="1040462" UNION SELECT * FROM gallery2 WHERE topic_id="411211" UNION SELECT * FROM gallery2 WHERE topic_id="1187670" UNION SELECT * FROM gallery2 WHERE topic_id="1714909" UNION SELECT * FROM gallery2 WHERE topic_id="518257"