I'm writting a cgi that returns multiple pages through the process of modifing a database. This code snippet controls which page body is returned. My question to fellow monks is this considered good programming practice? Is this is terrible design? Is there a more "modern" practice I should be using?

if (defined($q->param())) {
        if ($q->param('action') eq 'add') {
                if ($q->param('confirm')) {
                        if ($q->param('commit')) {
                                &commit_dialog();
                        } else {
                                &confirm_dialog();
                        }
                } else {
                        &add_dialog();
                }
        } elsif ($q->param('action') eq 'remove') {
                if ($q->param('confirm')){
                        if ($q->param('commit')) {
                                &commit_dialog();
                        } else {
                                &confirm_dialog();
                        }
                } else {
                        &choose_dialog();
                }
        } elsif ($q->param('action') eq 'modify') {
                if ($q->param('confirm')) {
                        if ($q->param('commit')) {
                                &commit_dialog();
                        } else {
                                &confirm_dialog();
                        }
                } else {
                        &choose_dialog();
                }
        } else {
                &action_dialog();
        }
} else {
        &action_dialog();
}
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<code>

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