what this javascript is for?
I actually quite often bump into these:

    <script type="text/javascript">
    
      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);
      })();
    
    </script>

but what is it for?
what this javascript is for?
===

I actually quite often bump into these:

    <script type="text/javascript">
    
      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);
      })();
    
    </script>

but what is it for?