? What exactly does this google script do?

<script>
<!--
document.cookie='atref=google.com$$; path=/;'
// -->
</script>
<script>
<!--
document.cookie='atexc=0,1,2,3,4,5,6,7,$$; path=/;'
// -->
</script>

Found it on a site listed #1 on google for a very competitive keyword.
And with 4 "subpages" listed below, like the major sites use to have on google.

 

Well im quite sure its javascript, not sure about its purpose though

 

Pretty sure it's a javascript too.

(I'm guessing that it tracks referrers from google and leaves a cookie)

It sure makes me curious

 

Had a look around and yep just looks like a bit of tracking code..

http://www.google.com/search?hl=en&lr=&q=atexc+javascript