You can possibly POST your authentication information to the form, and then have the script redirect the user: 
http://username:password@www.example.com/resource/

[download]
However, this puts the username and password not only in the clear for all to see, but in plain-text as part of the request.

Or, if your username/password is fairly static (never changes through use of the form), just have the form post its results to a CGI script using a variation of the URL above.

In reply to Re: Re: Passing a 401 header with CGI.pm ? by Fastolfe
in thread Passing a 401 header with CGI.pm ? by mr_roboto

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