{% assign tmp = '' %}
{% assign pageKey = '' %}
{% assign sorted_page_categories = page.categories | sort:"sorting" | sort:"title" %}
{% for category in sorted_page_categories %}
          {% if tmp == '' %}
          {% assign tmp = category %}
             {% else %}
         {% assign tmp = tmp | append: '_' | append: category | removeUnvantedChars %}
           {% endif %}
           {% assign pageKey = tmp | removeUnvantedChars  %}
    {% endfor %}
<div id="left_col">
    <div id="nav_level1_wrapper" class="level1">
         {{ site.leftNavigation[pageKey] }}
    </div>
</div>

{% assign tmp = '' %}
{% assign pageKey = '' %}
{% for category in page.categories %}
          {% if tmp == '' %}
          {% assign tmp = category %}
             {% else %}
         {% assign tmp = tmp | append: '_' | append: category | removeUnvantedChars %}
           {% endif %}
           {% assign pageKey = tmp | removeUnvantedChars  %}
    {% endfor %}
<div id="left_col">
    <div id="nav_level1_wrapper" class="level1">
         {{ site.leftNavigation[pageKey] }}
    </div>
</div>
Revert "Experiment with trying to sort left hand nav"
Revert "Experiment with trying to sort left hand nav"

This reverts commit 4cb774074e867d3178445aacf804cf7ca9560539.
It made the left hand nav not display at all.
