#!/usr/bin/perl -w

use strict;

use WWW::Mechanize;
use Crypt::SSLeay;
use HTTP::Cookies; 

my $agent = WWW::Mechanize->new();

my $cookie_file = "Cookies.txt";

$agent -> cookie_jar( HTTP::Cookies->new( File => $cookie_file, autosave => 1 ));

my $page = 'http://...';

# Request the page.
$agent -> get( $page );

# Set the radiobutton 'Radio' to the second option.
$agent -> set_fields( 'Radio' => '2' );

# Now post the poll form to the URL given in the source code under action="http://...".
$agent -> post( 'http://...' );