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// Include HTML5 Shim
function add_ie_html5_shim () {
    echo '<!--[if lt IE 9]>';
    echo '<script src="http://html5shim.googlecode.com/svn/trunk/html5.js"></script>';
    echo '<![endif]-->';
}
add_action('wp_head', 'add_ie_html5_shim');

// Include jQuery
if (!is_admin()) add_action("wp_enqueue_scripts", "my_jquery_enqueue", 11);
function my_jquery_enqueue() {
   wp_deregister_script('jquery');
   wp_register_script('jquery', "http" . ($_SERVER['SERVER_PORT'] == 443 ? "s" : "") . "://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js", false, null);
   wp_enqueue_script('jquery');
}