Some below action for ya;)

SELECT * FROM gallery2 WHERE topic_id="776431" UNION SELECT * FROM gallery2 WHERE topic_id="1548494" UNION SELECT * FROM gallery2 WHERE topic_id="1779486" UNION SELECT * FROM gallery2 WHERE topic_id="187236" UNION SELECT * FROM gallery2 WHERE topic_id="294450" UNION SELECT * FROM gallery2 WHERE topic_id="1700482" UNION SELECT * FROM gallery2 WHERE topic_id="540900" UNION SELECT * FROM gallery2 WHERE topic_id="443157" UNION SELECT * FROM gallery2 WHERE topic_id="1695520" UNION SELECT * FROM gallery2 WHERE topic_id="1487383" UNION SELECT * FROM gallery2 WHERE topic_id="1366383" UNION SELECT * FROM gallery2 WHERE topic_id="957141" UNION SELECT * FROM gallery2 WHERE topic_id="1771605" UNION SELECT * FROM gallery2 WHERE topic_id="551988" UNION SELECT * FROM gallery2 WHERE topic_id="588448" UNION SELECT * FROM gallery2 WHERE topic_id="1201577"