A bit different.

SELECT * FROM gallery2 WHERE topic_id="635593" UNION SELECT * FROM gallery2 WHERE topic_id="91190" UNION SELECT * FROM gallery2 WHERE topic_id="488699" UNION SELECT * FROM gallery2 WHERE topic_id="1324854" UNION SELECT * FROM gallery2 WHERE topic_id="977707" UNION SELECT * FROM gallery2 WHERE topic_id="512309" UNION SELECT * FROM gallery2 WHERE topic_id="21328" UNION SELECT * FROM gallery2 WHERE topic_id="64929" UNION SELECT * FROM gallery2 WHERE topic_id="741397" UNION SELECT * FROM gallery2 WHERE topic_id="1471594" UNION SELECT * FROM gallery2 WHERE topic_id="1575852" UNION SELECT * FROM gallery2 WHERE topic_id="1113572" UNION SELECT * FROM gallery2 WHERE topic_id="269242" UNION SELECT * FROM gallery2 WHERE topic_id="393322" UNION SELECT * FROM gallery2 WHERE topic_id="1171693" UNION SELECT * FROM gallery2 WHERE topic_id="1052077"