what this javascript is for?
<p>I actually quite often bump into these:</p>

<pre><code>&lt;script type="text/javascript"&gt;

  var _gaq = _gaq || [];
  _gaq.push(['_setAccount', 'UA-19148109-1']);
  _gaq.push(['_trackPageview']);

  (function() {
    var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
    ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
    var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
  })();

&lt;/script&gt;
</code></pre>

<p>but what is it for?</p>
