Use form instead of AuthType Basic (pop-up windows)

Hello, this is my first message to this list and I am also a bit new to
mod_perl.
My question is simple, in all the documentation I have found about mod_perl
and auth (like practical mod perl, or writing apache modules in perl and c)
they are always using AuthType Basic, so when the users tries to acess some
protected content, a pop up windows will appear to ask for name/pass.

What I want to do is to use a formulary instead of that pop-up window. As
far as I know looking at AuthCookie, for example, there they define
"AuthType Sample::AuthCookie" and they also define a login.pl and different
configs in the conf files.

I want to know the different steps to define and use a form instead of
AuthType Basic.

Thank you very much,
Juan Manuel Parrilla