Make page expire so that it can't be accessed with back button

Hi,
Can anyone help with a problem I have?
I've got a form sending credit card details which i'm sending with the post method to a servlet. When the user gets to the next page they can click back, change the details and submit it again. I wan't to stop this by having one of those "this page has expired" pages. Does anyone know how I can do this?
All my pages run through the same servlet which runs through the same jsp.
Many Thanks,
Phil

I'd prefer not to involve the users session if
possible though.Any reason for this? The session is created and maintained by the jsp engine whether you use it or not, so why not take advantage of it? If you're taking credit cards, evidently the users of your site are buying stuff, so how do you manage a shopping cart without a session?
I could do a similar thing to preaney's suggestion but
with a cookie instead of the session but i'm not a fan
of cookies when its not neccessary.The sessions are maintained with cookies ( or by URL rewriting when cookies can't be used ), so by explicitly storing cookies on the client is a lot like reinventing the wheel.

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Make page expire so that it can't be accessed with back button

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