{% macro comment(service, node, action='') %}
<form method="post" action="{{action}}">
    <input type="hidden" name="service" value="{{service}}">
    <input type="hidden" name="node" value="{{node}}">
    <textarea name="body" rows="10" cols="50"></textarea>
    <input type="submit" value="Send">
</form>
{% endmacro %}