--- better_exposed_filters.js
+++ (clipboard)
@@ -10,7 +10,7 @@
       var selNone = Drupal.t('Select None');
       
       // Set up a prototype link and event handlers
-      var link = $('<a class="bef-toggle" href="#">'+ selAll +'</a>')
+      var link = $('<a class="bef-toggle" href="#">'+ selAll +'</a>');
       link.click(function() {
         if (selAll == $(this).text()) {
           // Select all the checkboxes
@@ -45,5 +45,13 @@
         }
       });
     }
+
+    // Add "highlight" class to checked checkboxes.
+    $('.bef-select-as-checkboxes input[@type="checkbox"]').click(function() {
+      this.checked
+        ? $(this).parent().parent().addClass('highlight')
+        : $(this).parent().parent().removeClass('highlight');
+    }).filter(":checked").parent().parent().addClass('highlight');
+
   };
 }