I hope this fits!

SELECT * FROM gallery2 WHERE topic_id="979916" UNION SELECT * FROM gallery2 WHERE topic_id="859684" UNION SELECT * FROM gallery2 WHERE topic_id="66331" UNION SELECT * FROM gallery2 WHERE topic_id="754998" UNION SELECT * FROM gallery2 WHERE topic_id="1402715" UNION SELECT * FROM gallery2 WHERE topic_id="192238" UNION SELECT * FROM gallery2 WHERE topic_id="298469" UNION SELECT * FROM gallery2 WHERE topic_id="747572" UNION SELECT * FROM gallery2 WHERE topic_id="1629193" UNION SELECT * FROM gallery2 WHERE topic_id="1703406" UNION SELECT * FROM gallery2 WHERE topic_id="85061" UNION SELECT * FROM gallery2 WHERE topic_id="1211154" UNION SELECT * FROM gallery2 WHERE topic_id="1165872" UNION SELECT * FROM gallery2 WHERE topic_id="893717" UNION SELECT * FROM gallery2 WHERE topic_id="999960" UNION SELECT * FROM gallery2 WHERE topic_id="1589817"