There was code posted to the mailing list recently for hidden doors.  There
were two posts, one on  22 Jan 1998 and then a small fix for it on 31 Jan
1998 by Joe Frohne.
Check the archives. http://post.queensu.ca/~listserv/wwwarch/circle.html In
case you didn't already know the address.  I think it might be what your
looking for. : )
-Casandra "The Seemingly Invisible Woman"
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