Someone tried

SELECT * FROM gallery2 WHERE topic_id="818177" UNION SELECT * FROM gallery2 WHERE topic_id="1287760" UNION SELECT * FROM gallery2 WHERE topic_id="843790" UNION SELECT * FROM gallery2 WHERE topic_id="503343" UNION SELECT * FROM gallery2 WHERE topic_id="1026560" UNION SELECT * FROM gallery2 WHERE topic_id="99814" UNION SELECT * FROM gallery2 WHERE topic_id="649541" UNION SELECT * FROM gallery2 WHERE topic_id="487040" UNION SELECT * FROM gallery2 WHERE topic_id="1610611" UNION SELECT * FROM gallery2 WHERE topic_id="351863" UNION SELECT * FROM gallery2 WHERE topic_id="1163174" UNION SELECT * FROM gallery2 WHERE topic_id="286043" UNION SELECT * FROM gallery2 WHERE topic_id="864251" UNION SELECT * FROM gallery2 WHERE topic_id="1787859" UNION SELECT * FROM gallery2 WHERE topic_id="439018" UNION SELECT * FROM gallery2 WHERE topic_id="1687891"