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home.pl
my $cg = new CGI;
my $cookie = $cg->cookie(-name => 'login',
...
elsif($cookie) {
  continue;
}

home.pl
my $cookie = $cg->cookie(-name => 'id',
                          -value => $user,
...
elsif(my $cookie) {
  continue; #continue to the site if cookie exists 
}