> So my question is, how do I redirect back to the first page 
> from the second? Or is there another (better) way to achieve 
> the same result (perhaps by using just the one page)

Just post to the same script, and have it check whether it has been
posted to, and, optionally, an action parameter (in case a previous page
posts to it) to tell it which action needs to be taken.

-Doug