two different javascript codes- not tracking visitors (1 reply)

hi. . anyone - -
recently my piwik stopped working on hostgator for all my accounts except one
this old javascsript is working on the 1 website :
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<!-- Piwik -->
<script type="text/javascript">
var pkBaseURL = (("https:" == document.location.protocol) ? "https://www.pcnett.net/piwik/" : "http://www.pcnett.net/piwik/");
document.write(unescape("%3Cscript src='" + pkBaseURL + "piwik.js' type='text/javascript'%3E%3C/script%3E"));
</script><script type="text/javascript">
try {
var piwikTracker = Piwik.getTracker(pkBaseURL + "piwik.php", 3);
piwikTracker.setRequestMethod('POST');
piwikTracker.trackPageView();
piwikTracker.enableLinkTracking();
} catch( err ) {}
</script><noscript><p><img src="http://www.pcnett.net/piwik/piwik.php?idsite=3" style="border:0" alt="" /></p></noscript>
<!-- End Piwik Tracking Code -->
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

this newer script on all the rest is not :
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<!-- Piwik -->
<script type="text/javascript">
var _paq = _paq || [];
_paq.push(["trackPageView"]);
_paq.push(["enableLinkTracking"]);

(function() {
var u=(("https:" == document.location.protocol) ? "https" : "http") + "://www.pcnett.net/piwik/";
_paq.push(["setTrackerUrl", u+"piwik.php"]);
_paq.push(["setSiteId", "21"]);
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 Code -->
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any ideas why only the old one is working ?
should I just change all the rest to the old script code?