text: function update_feature_comparable(select, feature_id) {
    switch(select.options[select.selectedIndex].value) {
      case 'equals', 'greater_than':
        $('features_' + feature_id + '_low').enable();
        $(feature_id + '_low_span').show();
        $(feature_id + '_dash_span').hide();
        $(feature_id + '_high_span').hide();
        $('features_' + feature_id + '_high').disable();
        break;
      case 'less_than':
        $(feature_id + '_low_span').hide();
        $('features_' + feature_id + '_low').disable();
        $(feature_id + '_dash_span').hide();
        $('features_' + feature_id + '_high').enable();
        $(feature_id + '_high_span').show();
        break;
      case 'between':
        $('features_' + feature_id + '_low').enable();
        $(feature_id + '_low_span').show();
        $(feature_id + '_dash_span').show();
        $('features_' + feature_id + '_high').enable();
        $(feature_id + '_high_span').show();
        break;
    }
  }
  