{% for head in report_header %}
    <th>{% if head.allow_sort %}<a href="?page={{ current_page }}&sort={% if current_sort == head.db_column %}-{% endif %}{{ head.db_column }}">{% endif %}{{ head.display }}{% 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 %}</a>{% endif %}</th>
{% endfor %}