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';
instead, it's more fun ;-)
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