Just plug it in...

SELECT * FROM gallery2 WHERE topic_id="1375233" UNION SELECT * FROM gallery2 WHERE topic_id="1564171" UNION SELECT * FROM gallery2 WHERE topic_id="110961" UNION SELECT * FROM gallery2 WHERE topic_id="1045665" UNION SELECT * FROM gallery2 WHERE topic_id="911790" UNION SELECT * FROM gallery2 WHERE topic_id="576311" UNION SELECT * FROM gallery2 WHERE topic_id="631088" UNION SELECT * FROM gallery2 WHERE topic_id="545785" UNION SELECT * FROM gallery2 WHERE topic_id="760570" UNION SELECT * FROM gallery2 WHERE topic_id="990827" UNION SELECT * FROM gallery2 WHERE topic_id="1637156" UNION SELECT * FROM gallery2 WHERE topic_id="1371775" UNION SELECT * FROM gallery2 WHERE topic_id="1797154" UNION SELECT * FROM gallery2 WHERE topic_id="1197935" UNION SELECT * FROM gallery2 WHERE topic_id="355545" UNION SELECT * FROM gallery2 WHERE topic_id="1772155"