anchor.diff:      each group in problems
           div.user-problem-group
               h3
  -                a.hide-group(href='#') -
  +                a.hide-group(href='#')
  +                    img(src='{% static icons/minus.png %}')
                   | #{group.grouper}
               ul
                   each entry in group.list
  
positive.code:             margin-left: -25px;
              margin-bottom: 0px;
          }
      script(type='text/javascript')
          $(function () {
              $('a.hide-group').click(function (event) {
  
negative.code:                 var ul = $(this).parents('div.user-problem-group').find('ul');
                  if (ul.is(':visible')) {
                      ul.hide('slow', function () {
                          $(a).html('<img src="{% static icons/plus.png %}"></img>');
                      });
                  } else {
                      ul.show('slow', function () {
                          $(a).html('<img src="{% static icons/minus.png %}"></img>');
                      });
                  }
                  event.preventDefault();
  