<!-- Piwik -->
<script type="text/javascript">
  var _paq = _paq || [];
  (function(){
    var u=(("https:" == document.location.protocol) ? "https://<%= url %>/" : "http://<%= url %>/");
    _paq.push(['setSiteId', <%= id_site %>]);
    _paq.push(['setTrackerUrl', u+'piwik.php']);
    _paq.push(['trackPageView']);
    var d=document,
      g=d.createElement('script'),
      s=d.getElementsByTagName('script')[0];
    g.type='text/javascript';
    g.defer=true;
    g.async=true;
    g.src=u+'piwik.js';
    s.parentNode.insertBefore(g,s);
  })();
</script>
<!-- End Piwik Tag -->

<!-- Piwik -->
<script type="text/javascript">
  var _paq = _paq || [];
  _paq.push(["trackPageView"]);
  _paq.push(["enableLinkTracking"]);

  (function() {
    var u = (("https:" == document.location.protocol) ? "https" : "http") + "://<%= url %>/";
    _paq.push(["setTrackerUrl", u+"piwik.php"]);
    _paq.push(["setSiteId", <%= id_site %>]);
    var d=document,
      g=d.createElement("script"),
      s=d.getElementsByTagName("script")[0];
    g.type="text/javascript";
    g.defer=true;
    g.async=true;
    g.src=u+"piwik.js";
    s.parentNode.insertBefore(g,s);
  })();
</script>
<!-- End Piwik Tag -->

Update piwik's async tracking code to the latest version.
Update piwik's async tracking code to the latest version.