<!-- BEGIN chart/image.tt -->
[%
IF constraint_type; # add constraint type if included in call to image.tt:
target_url = target_url _ '?constraint_type=' _ constraint_type;
END;
%]
<div class="indent">
<img id="chart" src="[% target_url %]">
</div>
<p class="indent">[% site.html.back_button %]</p>
<!-- BEGIN chart/image.tt -->