Overcoming POSTDATA Warning

I'm hoping that someone here can help us out. I posted
this to "comp.lang.java.databases", but there doesn't
seem to be much activity there. We are in the process
of re-writing the underlying code for my website (link
to old version below). The site is (and will continue
to be) driven by PHP, javascript, and MySQL.

The problem I'd like to overcome is the browser's
navigation backwards through the tiers of screens and
menus. We have a "Back" link on the required pages, but
I would like to let the user navigate via the browser's
built in "Back" function, without getting the following
warning (from Netscape, in this case):

~~~~~~~~~~~~~~~~~~~~~~~~~~~
The page you are trying to view contains POSTDATA that
has expired from the cache. If you resend the data, any
action the form carried out (such as a search or online
purchase) will be repeated. To resend the data, click
OK. Otherwise, click Cancel.
~~~~~~~~~~~~~~~~~~~~~~~~~~~

There is no secure data, nor purchases involved. I
believe this is built into the browser, but I'm hoping
there is a way to bypass the warning without breaking
the function (creating an error) on the site. I believe
this is a javascript issue, but if I'm wrong, please
let me know and I will post to a PHP group.

TIA,
--
-- Jack --
==================================
The "Reply To:" information is
mangled with CAPS.
==================================
<http://shadetree-imaging.com/>
Wildlife Photography with
Emphasis on Birds
==================================
Poway, California (San Diego Co.)
N 32° 57' W 117° 04'
At 508' Elevation
==================================