Find the following, beginning on line 850 of post_info.asp, and change the 1 highlighted in green to 0:if Request.Form("lock") = 1 and ForumChkSkipAllowed = 1 then
strSql = strSql & ", 0 "
else
if Moderation = "Yes" then
strSql = strSql & ", 2 "
else
strSql = strSql & ", 1 "
end if
end if
You might also want to edit the "lock this topic" checkbox on post.asp so it's checked by default.