Newvie Question About script linking

[Daniel Lupton]

Hi
    I am new to Python and I am creating a dynamic website using CGI scripts
in Python. I have a login page in one script and the rest of the site linked
to a variety of other scripts.

What I want to know is how do I get the script to load the Login page if
their test of the cookie fails. i.e. if the user has not been validated and
when the test fails the login page is brought up.

I know how to do this with a html link but not through the python code
itself.

Thanks
Daniel