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Bug in ie5 history handling of expiring pages

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Hi Good people,

I have a problem that I hope someone out there might
have a work around for.

I have some ASP pages that are dynamic so I do not normally
want them to cache on the client. On the other hand they
include some user input as well and I do want the user to
be able to go back change some input on the last page and
then submit that to get a new version of the next page.

To achive this I give the pages a negative expire time as it
is my understanding that this will let the user go back and
forth in the history without accesing the server, but will
refetch them when addressed in any other way.

This works fine except for one detail. In one of the pages
I open a pop up window and this will on ie5 (5.50.4807.2300)
somehow confuse the browser. After the pop up has been open
if you back out of the page the old page will be refetched from
the server nulling out any user input. The same code works OK
on Netscape.

Has anybody familiar with this behaviour? Anybody now of a
work around?

The following code demonstrate the problem. If you run the page
select something in the listbox, push go and then hit back so
will the selection stay in the listbox. If you before leaving
the page push open it will reload the page!

Response.Expires = -1000 ' Expire at once

<script language="JavaScript">
function openGoogle()
// Format for the window
var f = 'toolbar=no,location=no,directories=no,status=no,'
f += 'menubar=no,scrollbars=no,resizable=yes,width=350, height=200'

var url = '//';

//Open progress window
var v = (url, '_blank', f)

<form name="f1" action="//">
<select name="foo" class="listbox">
<option value="1" selected>val 1</option>
<option value="2">val 2</option>
<option value="3">val 3</option>
<input type="button" class="inputButton" value="open" onClick="openGoogle();">
<input type="submit" class="inputButton" value="go">

Any help greatly appreciated!
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