Note that the JavaScript source option has been removed in 1.0.2, and replaced with a new config variable, together with a new external data URL config variable, allowing us to also serve avatars and attachment thumbnails from a different source.
This is in the config file for xenforo.com:
PHP:
// Requires XenForo 1.0.2
$config['externalDataUrl'] = 'http://xenforo.net/community/data';
$config['javaScriptUrl'] = 'http://xenforo.net/community/js';