preventing resending of post data

i am trying to make a forum in coldfusion and it is really coming along.

When a user tries to create a new thread or add a comment, they do so with "URL.action=addcomment" and that works fine submitting to the data and taking him back to the thread/comment page.

The problem is that if a user refreshes, the page can't do so without resending everything a messing everything up (it says that silly post data message). What is the easiest way to prevent this problem?

After you've handled the form post, do a cflocation to where ever you want the user to go. They can refresh as many times as they want to because they aren't posting form variables any more, you've started a new page request.