JS ROT13

Description:
Here is a short 17 line ROT13 encryption script, which can be adapted to rotate
numbers or different characters other than alpha-numerics, by the substring
method used in the script.

Script: (place this section in <head>.)
<script language="JavaScript" type="text/javascript">  </script>

Body: (place this section in <body>.)

<form>
<textarea name="normal" cols="30" rows="5">
Text to be encrypted
</textarea>
<input type="button" value="Encrypt / Decrypt" onclick="rot13(this.form);">
</form>