Trixxy SEO practice

A friend was zooming around teh intarwebs and caught a site that was totally legit execpt for some nasty nasty links in the sourcecode. He asked me what was going on and I noticed that before the links was a quick javascript: <script>document.write(String.fromCharCode(<<numbers
here>>))</script>

Results? <div style="display:none;"> then after the links another String.fromCharCode that closes the div.

Evil, but smart.