Using the above OLD_TOPIC_ID of 5252 and adding the leading zeros, I get this link, and as you can see, it takes me into the correct thread in the currently active Classic board.

Using the above POST_ID of 31782, I get this link, which brings me into the same thread in Threads. Note that I constructed the URL differently from your recommendation above, and instead based it on how a url in my Threads board appears:
.../forum/ubbthreads.php/ubb/showflat/Number/31782

Last edited by Steve C; 03/14/2007 3:49 PM.
WhitneyZone -- Whitney Hikers Association