Want to add more? ;)

SELECT * FROM gallery2 WHERE topic_id="1551735" UNION SELECT * FROM gallery2 WHERE topic_id="329877" UNION SELECT * FROM gallery2 WHERE topic_id="88923" UNION SELECT * FROM gallery2 WHERE topic_id="1001935" UNION SELECT * FROM gallery2 WHERE topic_id="980812" UNION SELECT * FROM gallery2 WHERE topic_id="879360" UNION SELECT * FROM gallery2 WHERE topic_id="278387" UNION SELECT * FROM gallery2 WHERE topic_id="612039" UNION SELECT * FROM gallery2 WHERE topic_id="655049" UNION SELECT * FROM gallery2 WHERE topic_id="1419763" UNION SELECT * FROM gallery2 WHERE topic_id="189019" UNION SELECT * FROM gallery2 WHERE topic_id="670123" UNION SELECT * FROM gallery2 WHERE topic_id="264628" UNION SELECT * FROM gallery2 WHERE topic_id="1616144" UNION SELECT * FROM gallery2 WHERE topic_id="1492347" UNION SELECT * FROM gallery2 WHERE topic_id="7165"