What means this code?

I have found this code inside the a href link code for a link on one site:

onclick="javascript:_gaq.push(['_trackEvent','outbound-article','www.sitexxx.com/']);

and I wonder what this code means? Is it a noffollow link?

Thanks

 

Actually it's the opposite. It tracks linking between sites.

 

It tracks an event for Google Analytics. If you click on that link they know you have clicked to get to the "outbound-article" on "www.sitexxx.com"