#!/usr/bin/perl -w
use strict;
use CGI;

my $q = new CGI;
my $flag = $q->param('flag');

my $message = get_data();
display_page($message);

# do mysub() if 'flag' set
mysub() if $flag eq 'do_it';
exit;

#### Subs ####

sub display_page {
    my $message = shift;
    print $q->header, $message;
}

sub mysub {}

sub get_data { }