--- checkbox_filter.js	Tue Mar 08 22:13:27 2011
+++ checkbox_filter-fixed.js	Tue Mar 08 22:03:48 2011
@@ -38,6 +38,6 @@ Drupal.CheckboxFilter.trim = function(st
  * and attach a filtering textfield to them.
  */
 Drupal.behaviors.checkboxfilter = function (context) {
-  $('div.form-checkboxes:has(.form-item)', context).before('<div class="form-item"><label>' + Drupal.t('Filter') + ':</label> <input class="checkbox-filter" type="text" size="8" /></div>');
+  $('div.form-checkboxes:has(.form-item)', context).before('<div class="checkbox-filter" class="form-item"><label>' + Drupal.t('Filter') + ':</label> <input type="text" size="8" /></div>');
   $("input.checkbox-filter").bind('keyup', Drupal.CheckboxFilter.filter); 
 }