Can I change the Kerberos/Squid error message for non-authenticated users?

[Robert Schenck <robschenck416@xxxxxxxxx>]

Hello,

Rather than get "ERROR: Cache Access Denied" when non-authenticated
users connect to the proxy, I'd rather have Squid prompt with a log-in
box, allowing users to log in with their Kerberos credentials. Is this
in any way possible?

Thanks a ton.