my $action = $cgi->param('action') || 'overview';

# main switch; see PBoard::Config for details
if (exists $PBoard::Config::Actions{$action}->{subroutine}) {
    $PBoard::Config::Actions{$action}->{subroutine}->($cgi, $action);
} # if
else { # execute default action; maybe replace it by errorhandling later
    $PBoard::Config::Actions{'overview'}->{subroutine}->($cgi, 'overview');
} # else