function loadJQuery() {
echo '<script src="' . BLOG_URL . 'include/lib/js/jquery/jquery-1.7.1.js" type="text/javascript"></script>';
}
把echo一行改为:
echo '<script src="http://lib-cdn.qiniudn.com/js/jquery/1.7.2/jquery.min.js" type="text/javascript"></script>';