When I view my code for the page header.php in firebug I find (https://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js?ver=1.6.2) and I don't find (/includes/jquery-1.4.2.min.js). Viewing the same page offline, everything is reversed. Since I can't find the google version of jQuery how can it be upgraded, I don't know where it's stored to upgrade etc ? The second version of jQuery, I could simply delete from my code.

 

In your head code you've probably got a local fallback