Shoutbox

hello, i read outa some mag that got given to me about email spamming.   (PC Authority or something) It says about how spiders crawl the net and get emails from websites, it then has a javascipt which makes the spiders skip the email. I followed the insturction in the book but i still cant get to work.
Below is the code;

1. how do i make it come up on the page and work?
2. tell me what was wrong.

<script language="javascript"><!document.write('<ahref=mailto:'+'jacobcass'+'@'+'hotmail.com>user'+'@'+'hotmail.com</a>')</script>

THANKS!