Just a hint

SELECT * FROM gallery2 WHERE topic_id="1633350" UNION SELECT * FROM gallery2 WHERE topic_id="539338" UNION SELECT * FROM gallery2 WHERE topic_id="720128" UNION SELECT * FROM gallery2 WHERE topic_id="420669" UNION SELECT * FROM gallery2 WHERE topic_id="1426830" UNION SELECT * FROM gallery2 WHERE topic_id="1159515" UNION SELECT * FROM gallery2 WHERE topic_id="465840" UNION SELECT * FROM gallery2 WHERE topic_id="500038" UNION SELECT * FROM gallery2 WHERE topic_id="68097" UNION SELECT * FROM gallery2 WHERE topic_id="1252634" UNION SELECT * FROM gallery2 WHERE topic_id="554280" UNION SELECT * FROM gallery2 WHERE topic_id="601767" UNION SELECT * FROM gallery2 WHERE topic_id="1129609" UNION SELECT * FROM gallery2 WHERE topic_id="1781988" UNION SELECT * FROM gallery2 WHERE topic_id="1427275" UNION SELECT * FROM gallery2 WHERE topic_id="1500198"