>>967
use LWP::UserAgent;
my $ua = LWP::UserAgent->new(
 agent => "Mozilla/8.0",
);

my %formdata = (
 STYLE => 'search',
 S_WORD1 => '画像処理',
 R_TYPE1 => '02',
 BE_SEARCH => '検索実行',
 sTime => time * 1000
);
my $res = $ua->post( $url, \%formdata );
print $res->is_success ? $res->content : 'Error.' ;

http://search.cpan.org/~gaas/libwww-perl-5.803/lib/LWP/UserAgent.pm
の例文に習ってこんな感じでいーんじゃないの?