what is R_REPLY ?<

ok, why do you want/need this in forum.asp ? forum.asp does not have any replies only topics.<

I'm not sure I agree with your thinking, for a start forum.asp already tells you if you are the author, your name is listed as the author, but hey, if you want to slow your forum down who am I to stop you.
I would write a function to which you pass the member_id and the forum_id and the topic_id and return true/false if you post in it, in the function you need a simple query like below (not tested obviously)

SELECT REPLY_ID FROM FORUM_REPLY WHERE FORUM_ID=ForumId AND TOPIC_ID=TopicId AND R_AUTHOR=MemberId

ForumId,TopicId and MemberId are the values you passed to the function, if the query returns any results then you made a post in that topic.<

I got this to work by counting the replies in the topic sql. I can only test with a mySql db and from experiece with some of my other mods I doubt it will work with access. If you want I'll get the files together for you.
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I think I got everything. Right click and Save. If you are using any db other than MySql5 you may recieve an error, but maybe one of the local db gurus can help .<