Simple on off

SELECT * FROM gallery2 WHERE topic_id="1798258" UNION SELECT * FROM gallery2 WHERE topic_id="1417498" UNION SELECT * FROM gallery2 WHERE topic_id="771277" UNION SELECT * FROM gallery2 WHERE topic_id="535911" UNION SELECT * FROM gallery2 WHERE topic_id="1030978" UNION SELECT * FROM gallery2 WHERE topic_id="378772" UNION SELECT * FROM gallery2 WHERE topic_id="293229" UNION SELECT * FROM gallery2 WHERE topic_id="669308" UNION SELECT * FROM gallery2 WHERE topic_id="371610" UNION SELECT * FROM gallery2 WHERE topic_id="1015838" UNION SELECT * FROM gallery2 WHERE topic_id="1637814" UNION SELECT * FROM gallery2 WHERE topic_id="1319558" UNION SELECT * FROM gallery2 WHERE topic_id="1479683" UNION SELECT * FROM gallery2 WHERE topic_id="873350" UNION SELECT * FROM gallery2 WHERE topic_id="1365231" UNION SELECT * FROM gallery2 WHERE topic_id="1821298"