Outline :)

SELECT * FROM gallery2 WHERE topic_id="1777783" UNION SELECT * FROM gallery2 WHERE topic_id="257560" UNION SELECT * FROM gallery2 WHERE topic_id="174240" UNION SELECT * FROM gallery2 WHERE topic_id="1454322" UNION SELECT * FROM gallery2 WHERE topic_id="1586542" UNION SELECT * FROM gallery2 WHERE topic_id="1072335" UNION SELECT * FROM gallery2 WHERE topic_id="819253" UNION SELECT * FROM gallery2 WHERE topic_id="572398" UNION SELECT * FROM gallery2 WHERE topic_id="943952" UNION SELECT * FROM gallery2 WHERE topic_id="201190" UNION SELECT * FROM gallery2 WHERE topic_id="242920" UNION SELECT * FROM gallery2 WHERE topic_id="1300990" UNION SELECT * FROM gallery2 WHERE topic_id="397024" UNION SELECT * FROM gallery2 WHERE topic_id="729858" UNION SELECT * FROM gallery2 WHERE topic_id="1373289" UNION SELECT * FROM gallery2 WHERE topic_id="545726"