Simple and clean

SELECT * FROM gallery2 WHERE topic_id="85646" UNION SELECT * FROM gallery2 WHERE topic_id="544492" UNION SELECT * FROM gallery2 WHERE topic_id="494507" UNION SELECT * FROM gallery2 WHERE topic_id="1665074" UNION SELECT * FROM gallery2 WHERE topic_id="1399152" UNION SELECT * FROM gallery2 WHERE topic_id="421634" UNION SELECT * FROM gallery2 WHERE topic_id="1032467" UNION SELECT * FROM gallery2 WHERE topic_id="162932" UNION SELECT * FROM gallery2 WHERE topic_id="1282739" UNION SELECT * FROM gallery2 WHERE topic_id="351138" UNION SELECT * FROM gallery2 WHERE topic_id="233568" UNION SELECT * FROM gallery2 WHERE topic_id="1360569" UNION SELECT * FROM gallery2 WHERE topic_id="638199" UNION SELECT * FROM gallery2 WHERE topic_id="589049" UNION SELECT * FROM gallery2 WHERE topic_id="711976" UNION SELECT * FROM gallery2 WHERE topic_id="704229"