Expiring pages for IE5

I have a site that requires users to be logged in; information about
the user is maintained in session variables.  The problem is that when
the user logs out, the IE5 back button can still be used to review
pages that were fine when logged in but shouldn't be visible now.  IE4
and Netscape block revisiting old pages just fine.

I have the following on each page:
<meta http-equiv="expires" content="Wed, 1 December 1999 00:00:00 CST">
<meta http-equiv="pragma" content="nocache">

These are asp pages served by IIS4.  On the page that processes the
"logout" request, I execute session.abandon

Sorry, its an intranet site so I can't give you the URL.

Any ideas on how I can enhance my page protection to include IE5?

(I've thought about using Javascript to open a new browser then close
the original browser so that they are still looking at a page but
without a cached history.  However, having to go to that extreme seems
absurd.)

TIA,
--Doug


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