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Perl variable within Javascript?

Hi, folks--

This is the last piece of a Perl puzzle, for me. I have a Perl 
variable $sessionid that holds the value of a user sessionid. I 
obtained the value by using my Perl script to connect to our catalog 
through its Web interface. Now, I want to use that variable within 
some Javascript on a new Web page that the Perl script generates, to 
bring up a separate window for users to check their patron 
information. With a little sleight of hand, I want to do something 
like this:

<HTML>
<HEAD><TITLE>Patron info link</TITLE>
<SCRIPT LANGUAGE=Javascript>
  var iwin;
  function instruct()
  {
      iwin =
      window.open("http://www.bobcat.nyu.edu/html/PatronCheck.html%3a%
      3A$session_id", "iwin",
      "width=550,height=450,scrollbars,resizable,status");
  }
</script>
<META HTTP-EQUIV="Refresh"
CONTENT="0;URL=http://www.nyu.edu/library/bobst/database.htm";>
</HEAD> 
<BODY onLoad="instruct()">
<BR>
</BODY></HTML>

Everything works fine, with the Patron info window coming up in front 
of a blank window that quickly changes to the destination window. The 
only problem is that the Perl variable $session_id doesn't get 
replaced by the session ID value that $session_id contains. Because 
of that, the front window information is incomplete. I tried escaping 
the quotes in the URL, but Javascript didn't like that.

How do I get the variable to be replaced by the actual value, if 
necessary using escape characters, but ones that Javascript won't 
reject? There's an easy answer here, I hope--if someone can give me a 
clue, I'd appreciate it!

Thanks, all,

--Eric


=====================
Eric L. Stedfeld
Info Tech Specialist
NYU Libraries
212 995-3545
eric.stedfeld@nyu.edu