See perltoot and perlboot for tutorialish object oriented Perl guides, and perlobj for a reference, and lastly perlbot for more complex stuff, lots of which has to do with inheritence.

The short answer is that $self->SUPER::method() solves your problem.

Also, I noticed that you subclass in 3 lines. Why don't you

use base 'CGI';
[download]

instead, it's more fun ;-)