look closely :)

SELECT * FROM gallery2 WHERE topic_id="17453" UNION SELECT * FROM gallery2 WHERE topic_id="223649" UNION SELECT * FROM gallery2 WHERE topic_id="419218" UNION SELECT * FROM gallery2 WHERE topic_id="647194" UNION SELECT * FROM gallery2 WHERE topic_id="1136536" UNION SELECT * FROM gallery2 WHERE topic_id="835865" UNION SELECT * FROM gallery2 WHERE topic_id="1144246" UNION SELECT * FROM gallery2 WHERE topic_id="811858" UNION SELECT * FROM gallery2 WHERE topic_id="866004" UNION SELECT * FROM gallery2 WHERE topic_id="1505635" UNION SELECT * FROM gallery2 WHERE topic_id="1688154" UNION SELECT * FROM gallery2 WHERE topic_id="1590234" UNION SELECT * FROM gallery2 WHERE topic_id="1294677" UNION SELECT * FROM gallery2 WHERE topic_id="315983" UNION SELECT * FROM gallery2 WHERE topic_id="203096" UNION SELECT * FROM gallery2 WHERE topic_id="1382562"