I wonder if anyone can offer me a few pointers..?

I'm building a portal to do various bits and bobs. I'm using sessions to
facilitate the user authentication/login, etc. The only problem I have
is that when viewing these (.php) pages in IE once the session variable
has been set, a "Warning: Page has Expired " page is displayed whenever
the 'Back' button is pressed. This means that the user can only access
the page again by hitting 'Refresh' (and therefore posting the form data
back & executing whatever scripts again).

The rest of IE's error message reads, "The page you requested was
created using information you submitted in a form. This page is no
longer available. As a security precaution, Internet Explorer does not
automatically resubmit your information for you."

I know from using other web applications (Hotmail is one example), that
this doesn't always have to be the case. Is there anyway I can eliminate
this security precaution on the *server side* i.e. without telling users
to ditch IE ;-)

Thanks very much in advance for any advice.

- Best regards,


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