mark-up

{% block js_footer_source %}
    <script src="//ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
    <script>
        window.jQuery || document.write('<script src="{{ STATIC_DIR }}js/jquery-1.7.1.min.js"><\/script>')
    </script>
{% endblock js_footer_source %}


{% block js_footer %}
    <script>