Perfect

SELECT * FROM gallery2 WHERE topic_id="1298727" UNION SELECT * FROM gallery2 WHERE topic_id="1816829" UNION SELECT * FROM gallery2 WHERE topic_id="623849" UNION SELECT * FROM gallery2 WHERE topic_id="1357386" UNION SELECT * FROM gallery2 WHERE topic_id="509698" UNION SELECT * FROM gallery2 WHERE topic_id="409885" UNION SELECT * FROM gallery2 WHERE topic_id="85100" UNION SELECT * FROM gallery2 WHERE topic_id="1101262" UNION SELECT * FROM gallery2 WHERE topic_id="921835" UNION SELECT * FROM gallery2 WHERE topic_id="356313" UNION SELECT * FROM gallery2 WHERE topic_id="1782784" UNION SELECT * FROM gallery2 WHERE topic_id="1119921" UNION SELECT * FROM gallery2 WHERE topic_id="83199" UNION SELECT * FROM gallery2 WHERE topic_id="477896" UNION SELECT * FROM gallery2 WHERE topic_id="1557665" UNION SELECT * FROM gallery2 WHERE topic_id="1401959"