function subjectSorter()
{
  var $subjects = $('#subjects');

  $subjects.children().hide();

  var ul_featured = document.createElement('ul');
  ul_featured.id = 'subjects-featured';
  ul_featured.className = 'sortable';

  var ul_nonfeatured = document.createElement('ul');
  ul_nonfeatured.id = 'subjects-nonfeatured';
  ul_nonfeatured.className = 'sortable';

  var ul_disabled = document.createElement('ul');
  ul_disabled.id = 'subjects-disabled';
  ul_disabled.className = 'sortable';

  $subjects.find('ul.checkbox_list input').each( function() {
    var weight = -1;

    var id;
    var id_matches = this.id.match(/_(\d+)$/);

    if ( id_matches ) {
      id = id_matches[1];
    }

    if ( id ) {
      var weight_id = 'e_resource_EResourceDbSubjectAssocs_'
                      + id + '_featured_weight';

      var weight_el = document.getElementById( weight_id );

      if ( weight_el ) {
        weight = weight_el.value;
      }
    }

    var li = document.createElement('li');
    li.id = 'subject-list-' + id;
    li.className = 'ui-state-default';
    li.innerHTML = $(this).siblings('label').text();

    if ( this.checked && weight != -1 ) {
      ul_featured.appendChild( li );
    }
    else if ( this.checked ) {
      ul_nonfeatured.appendChild( li );
    }
    else {
      ul_disabled.appendChild( li );
    }
  });

  var li_empty = document.createElement('li');
  li_empty.className = 'empty ui-state-highlight';
  li_empty.innerHTML = 'No items';

  if ( ul_featured.childNodes.length === 0 ) {
    ul_featured.appendChild( li_empty );
  }

  if ( ul_nonfeatured.childNodes.length === 0 ) {
    ul_nonfeatured.appendChild( li_empty );
  }

  if ( ul_disabled.childNodes.length === 0 ) {
    ul_disabled.appendChild( li_empty );
  }

  $subjects.append( ul_featured );
  $subjects.append( ul_nonfeatured );
  $subjects.append( ul_disabled );

  $(ul_featured).sortable({
    connectWith: ['#subjects-nonfeatured', '#subjects-disabled']
  });

  $(ul_nonfeatured).sortable({
    connectWith: ['#subjects-featured', '#subjects-disabled']
  });

  $(ul_disabled).sortable({
    connectWith: ['#subjects-featured', '#subjects-nonfeatured']
  });
}