{% for head in report_header %}
    <th {% if head.col_description %}title="{{ head.col_description }}"{% endif %}>
        {% if head.allow_sort %}
            <a class="sortable-table-header" href="?page={{ current_page }}&sort={% if current_sort == head.db_column %}-{% endif %}{{ head.db_column }}">
        {% endif %}{{ head.display|safe }}{% if head.allow_sort %}&nbsp;

            {% if current_sort == head.db_column %}
                <i class="icon-chevron-down"></i>
            {% elif current_sort == '-'|add:head.db_column %}
                <i class="icon-chevron-up"></i>
            {% endif %}

            {% if secondary_sort == head.db_column %}
                <i class="icon-chevron-down" style="color: orange"></i>
            {% elif secondary_sort == '-'|add:head.db_column %}
                <i class="icon-chevron-up" style="color: orange"></i>
            {% endif %}
            </a>
        {% endif %}
    </th>
{% endfor %}