This mod has a flaw, as your forgot something. You didn't add the tracking code on the ARCHIVE section of vbulletin, which is available by default at
http://www.url.com/forum/archive/index.php.
Here is how to add this, I hope this helps on adding this feature on a future release.
Create a new plugin at hook archive_complete.
Add the following code:
Code:
$code="<script type=\"text/javascript\">
var _gaq = _gaq || [];
_gaq.push(['_setAccount', 'UA-11076357-1']);
_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></head>";
$output=str_replace("</head>",$code,$output);
I hope this helps.