Additionally, you most certainly wouldn't want to reload utag.sync.js, because it is likely to contain document.write statements, which would be catastrophic for a single page AJAX app - the page would most likely be wiped out completely by the document.write calls. utag.sync.js should only be implemented once per page, and in the head only. (I'm assuming this is a true single page app with no "reload" between page views).
Hope this helps.
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