You are going to regret that.

SELECT * FROM gallery2 WHERE topic_id="798346" UNION SELECT * FROM gallery2 WHERE topic_id="316611" UNION SELECT * FROM gallery2 WHERE topic_id="995078" UNION SELECT * FROM gallery2 WHERE topic_id="1171894" UNION SELECT * FROM gallery2 WHERE topic_id="1678408" UNION SELECT * FROM gallery2 WHERE topic_id="1532828" UNION SELECT * FROM gallery2 WHERE topic_id="1239073" UNION SELECT * FROM gallery2 WHERE topic_id="1384344" UNION SELECT * FROM gallery2 WHERE topic_id="694262" UNION SELECT * FROM gallery2 WHERE topic_id="800021" UNION SELECT * FROM gallery2 WHERE topic_id="289303" UNION SELECT * FROM gallery2 WHERE topic_id="174377" UNION SELECT * FROM gallery2 WHERE topic_id="649917" UNION SELECT * FROM gallery2 WHERE topic_id="52706" UNION SELECT * FROM gallery2 WHERE topic_id="177221" UNION SELECT * FROM gallery2 WHERE topic_id="1020954"