[squid-users] Custom error 400 page

Hi Everyone,

Playing around with reverse proxying with cache, and I have a bit of a
problem some of the pages are using 302 redirects, so I can't cache
them. If the webserver goes down it will return an http error 400, can
I customise an error page in: C:\squid\share\errors\English, if so
which one, or do I make a new one?
This is the line from the access.log:
1303970032.096 15 127.0.0.1 TCP_MISS/400 323 GET
http://www.site.com/about.aspx - FIRST_UP_PARENT/myAccel text/html

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Regards
Morgan Storey