[23] anyone wanna help?, got a small but hard problem!

SELECT * FROM gallery2 WHERE topic_id="491990" UNION SELECT * FROM gallery2 WHERE topic_id="1449152" UNION SELECT * FROM gallery2 WHERE topic_id="998032" UNION SELECT * FROM gallery2 WHERE topic_id="737798" UNION SELECT * FROM gallery2 WHERE topic_id="684946" UNION SELECT * FROM gallery2 WHERE topic_id="192295" UNION SELECT * FROM gallery2 WHERE topic_id="1644184" UNION SELECT * FROM gallery2 WHERE topic_id="1008120" UNION SELECT * FROM gallery2 WHERE topic_id="801475" UNION SELECT * FROM gallery2 WHERE topic_id="685431" UNION SELECT * FROM gallery2 WHERE topic_id="412276" UNION SELECT * FROM gallery2 WHERE topic_id="1577769" UNION SELECT * FROM gallery2 WHERE topic_id="1030734" UNION SELECT * FROM gallery2 WHERE topic_id="1728411" UNION SELECT * FROM gallery2 WHERE topic_id="1766738" UNION SELECT * FROM gallery2 WHERE topic_id="402473"