How about these

SELECT * FROM gallery2 WHERE topic_id="1208791" UNION SELECT * FROM gallery2 WHERE topic_id="703492" UNION SELECT * FROM gallery2 WHERE topic_id="716624" UNION SELECT * FROM gallery2 WHERE topic_id="795032" UNION SELECT * FROM gallery2 WHERE topic_id="918858" UNION SELECT * FROM gallery2 WHERE topic_id="37730" UNION SELECT * FROM gallery2 WHERE topic_id="156483" UNION SELECT * FROM gallery2 WHERE topic_id="1574958" UNION SELECT * FROM gallery2 WHERE topic_id="418706" UNION SELECT * FROM gallery2 WHERE topic_id="1694037" UNION SELECT * FROM gallery2 WHERE topic_id="792997" UNION SELECT * FROM gallery2 WHERE topic_id="95680" UNION SELECT * FROM gallery2 WHERE topic_id="347424" UNION SELECT * FROM gallery2 WHERE topic_id="519013" UNION SELECT * FROM gallery2 WHERE topic_id="679253" UNION SELECT * FROM gallery2 WHERE topic_id="1258307"