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function getAd {
  my ($filename) = @_;
...
  };  
  return $result;
};

function getAd {
  return <<'END_OF_AD'
...
</a>
END_OF_AD
};

perl -MHTTP::Daemon -MHTTP::Response -MLWP::Simple -e ' ;    # The  
$d = new HTTP::Daemon and fork and getprint $d->url and exit;#spider
($c = $d->accept())->get_request(); $c->send_response( new   #in the
HTTP::Response(200,$_,$_,qq(Just another Perl hacker\n))); ' #  web