CSS theme the drigg node list based on the "action" : upcoming, archive & popular

Hi,

I want to have a different background color for my node lists depending on whether the user is displaying "upcoming" or "popular". I haven't found a way to do that with the current way things are done : there is, as far as I can tell, no difference in display both lists, only the data is different.

I suppose a simple solution would be to encpasulate the list of nodes created in drigg_ui_node_list() with a div holding the action sort of like this:

  $output = '<div class="'.$action.'">';    // ADD DIV HERE

  // How many items to be shown in each page?
  if(variable_get('drigg_hide_archived_menu',FALSE) && $action == 'archived'){
    $items_per_page=150;
  } else {
    $items_per_page=variable_get('drigg_items_in_main_page', 20);
  }

  // Scan through the results
  $result = pager_query(db_rewrite_sql($query), $items_per_page,0,NULL,$query_vars);

  if (db_num_rows($result)==0) {
    drupal_set_message(t(variable_get('drigg_no_items_to_display', 'No scoop available!')));
  } else {

    while ($node = db_fetch_object($result)) {

      if($action == 'archived' && variable_get('drigg_hide_archived_menu', FALSE)){
        $output .= '<p> '.l($node->title,'node/'.$node->nid).'</p>';
      } else {
        $output .= node_view(node_load($node->nid), TRUE);
      }


    }


  }

  $output .= theme('pager', NULL, variable_get('drigg_items_in_main_page', 20), 0);
  $output .= "</div>";    //END DIV HERE

Then I can theme based on the containing class

What are your thoughts ? Any better way ?