I had exactly the same problem with back/forward and i found the script that
does the job:

""olinux"" <    > wrote in message
I am using sessions to store variables until all forms have been filled out.
at this point they are put into the db.
I would like to know how i can eliminate the problem that occurs when the
user presses the back button.  I receive a "warning, page has expired...
press refresh" I know that pressing refresh works fine, but some people do
not understand and get confused. How can i fix this?

thanks much

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