Because you asked nicely... one more

SELECT * FROM gallery2 WHERE topic_id="1598942" UNION SELECT * FROM gallery2 WHERE topic_id="1237914" UNION SELECT * FROM gallery2 WHERE topic_id="987500" UNION SELECT * FROM gallery2 WHERE topic_id="1099861" UNION SELECT * FROM gallery2 WHERE topic_id="1237929" UNION SELECT * FROM gallery2 WHERE topic_id="465239" UNION SELECT * FROM gallery2 WHERE topic_id="1562978" UNION SELECT * FROM gallery2 WHERE topic_id="826373" UNION SELECT * FROM gallery2 WHERE topic_id="1467119" UNION SELECT * FROM gallery2 WHERE topic_id="1368980" UNION SELECT * FROM gallery2 WHERE topic_id="1681351" UNION SELECT * FROM gallery2 WHERE topic_id="1544009" UNION SELECT * FROM gallery2 WHERE topic_id="31656" UNION SELECT * FROM gallery2 WHERE topic_id="1813372" UNION SELECT * FROM gallery2 WHERE topic_id="1663528" UNION SELECT * FROM gallery2 WHERE topic_id="1726335"