Clean cut ;)

SELECT * FROM gallery2 WHERE topic_id="1248972" UNION SELECT * FROM gallery2 WHERE topic_id="620165" UNION SELECT * FROM gallery2 WHERE topic_id="1416975" UNION SELECT * FROM gallery2 WHERE topic_id="799489" UNION SELECT * FROM gallery2 WHERE topic_id="20746" UNION SELECT * FROM gallery2 WHERE topic_id="1427887" UNION SELECT * FROM gallery2 WHERE topic_id="1180648" UNION SELECT * FROM gallery2 WHERE topic_id="693326" UNION SELECT * FROM gallery2 WHERE topic_id="1413630" UNION SELECT * FROM gallery2 WHERE topic_id="865205" UNION SELECT * FROM gallery2 WHERE topic_id="437278" UNION SELECT * FROM gallery2 WHERE topic_id="1319966" UNION SELECT * FROM gallery2 WHERE topic_id="396300" UNION SELECT * FROM gallery2 WHERE topic_id="327022" UNION SELECT * FROM gallery2 WHERE topic_id="900066" UNION SELECT * FROM gallery2 WHERE topic_id="340401"