king for?
              <ul>
                  {% if theme_lang == 'c' %}
                  {% endif %}
                  {% if theme_lang == 'cpp' %}
                    <li>Try the <a href="http://opencv.willowgarage.com/wiki/Welcome?action=AttachFile&do=get&target=opencv_cheatsheet.pdf">Cheatsheet</a>.</li>
                  {% endif %}
                  {% if theme_lang == 'py' %}
                    <li>Try the <a href="cookbook.html">Cookbook</a>.</li>
                  {% endif %}
                  <