in reply to How could I use CGI to hide my javascript code?

CGI::Session can provide a session. 
...Setup the session and output CGI headers...

$session->param(js => 1);

print <<'__EOI__';
<html>
<head>
<script type="text/javascript" src="javascript.php"></script>
<title>Untitled Document</title>
</head>
</html>
__EOI__

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...Setup the session and output CGI headers...

if ($session->param('js')) {
   print <<'__EOI__';

document.write("Hello World!");

__EOI__
}

$session->param(js => 0);

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In Section Seekers of Perl Wisdom