How to modify the rendering of a wdget in admin template?

Question

I am trying to overrride the "admin/includes/fieldset.html" template. I am rendering "Group", a ModelMultipleChoiceField field as a CheckboxSelectMultiple widget. However I want to change the display depending on the choices selected.

      {% if field.is_checkbox %}
          {{ field.field }}{{ field.label_tag }}
      {% else %}
          {% ifequal field.field.field.label "Group" %}               
            {{ field.label_tag }} 
            {% for value in field.field.field.queryset.values %}
                {{value}}<p/>
            {% endfor%}
          {% else %}
            {{ field.label_tag }}{{ field.field }}
          {% endifequal %}
      {% endif %}

Is there a way to know which choices are selected and which are not. Right now what I am getting is all the available values and I am not able to distinguish which are selected.