diff --git a/better_statistics.module b/better_statistics.module
index 4bec390..c4eb989 100644
--- a/better_statistics.module
+++ b/better_statistics.module
@@ -26,6 +26,10 @@ define('BETTER_STATISTICS_ENTITY_VIEW_DISABLED', 0);
 define('BETTER_STATISTICS_ENTITY_VIEW_DEFAULT', 1);
 define('BETTER_STATISTICS_ENTITY_VIEW_CLIENT', 2);
 
+/**
+ * Cookie name for cache status.
+ */
+define('BETTER_STATISTICS_CACHE_COOKIE', 'Drupal.cache.status');
 
 /**
  * Implements hook_menu().
@@ -97,6 +101,42 @@ function better_statistics_ctools_plugin_api_hook_name() {
   return 'statistics_api';
 }
 
+/**
+ * Implements hook_boot().
+ *
+ * On cached pages, adds a reference cookie to the HTTP response to track
+ * the Drupal cache status.
+ */
+function better_statistics_boot() {
+  // Ensure variables can be accessed.
+  drupal_bootstrap(DRUPAL_BOOTSTRAP_VARIABLES, FALSE);
+
+  // Return if Better Statistics is disabled or in default mode.
+  $al_mode = variable_get('statistics_enable_access_log', BETTER_STATISTICS_ACCESSLOG_DISABLED);
+  if ($al_mode == BETTER_STATISTICS_ACCESSLOG_DISABLED || $al_mode == BETTER_STATISTICS_ACCESSLOG_DEFAULT) {
+    return;
+  }
+
+  // Is Drupal page caching enabled.
+  $drupal_cache_enabled = variable_get('cache');
+
+  // Is Better Statistics enabled to track cached pages.
+  $bs_cache_logging = variable_get('statistics_access_log_restrictions_cache', TRUE);
+
+  // Set a cookie with cache status retrieved from the headers.
+  if ($drupal_cache_enabled && $bs_cache_logging) {
+    $headers = headers_list();
+    if (array_search('X-Drupal-Cache: HIT', $headers) !== FALSE) {
+      setcookie(BETTER_STATISTICS_CACHE_COOKIE, 'HIT', REQUEST_TIME + 60);
+    }
+    elseif (array_search('X-Drupal-Cache: MISS', $headers) !== FALSE) {
+      setcookie(BETTER_STATISTICS_CACHE_COOKIE, 'MISS', REQUEST_TIME + 60);
+    }
+    else {
+      setcookie(BETTER_STATISTICS_CACHE_COOKIE, 'void', REQUEST_TIME + 60);
+    }
+  }
+}
 
 /**
  * Implements hook_exit().
@@ -495,21 +535,3 @@ function better_statistics_add_js_api() {
 
   return $js_added;
 }
-
-function better_statistics_boot() {
-  drupal_bootstrap(DRUPAL_BOOTSTRAP_VARIABLES, FALSE);
-  $cache_enabled = variable_get('cache');
-  $al_mode = variable_get('statistics_enable_access_log', BETTER_STATISTICS_ACCESSLOG_DISABLED);
-  if ($cache_enabled && ($al_mode == BETTER_STATISTICS_ACCESSLOG_MIXED || $al_mode == BETTER_STATISTICS_ACCESSLOG_CLIENT)) {
-    $headers = headers_list();
-    if (array_search('X-Drupal-Cache: HIT', $headers) !== FALSE) {
-      setcookie('Drupal.cache.status', 'HIT', time() + 60);
-    }
-    elseif (array_search('X-Drupal-Cache: MISS', $headers) !== FALSE) {
-      setcookie('Drupal.cache.status', 'MISS', time() + 60);
-    }
-    else {
-      setcookie('Drupal.cache.status', 'void', time() + 60);
-    }
-  }
-}
diff --git a/js/fields/custom.js b/js/fields/custom.js
index 4ea6e48..f2a4bb0 100644
--- a/js/fields/custom.js
+++ b/js/fields/custom.js
@@ -1,16 +1,18 @@
-function getCookieVal(key) {
-  var tmp = document.cookie.match((new RegExp(key + '=[a-zA-Z0-9.()=|%/_]+($|;)', 'g')));
-  if (!tmp || !tmp[0]) {
-    return null;
-  }
-  else {
-    return unescape(tmp[0].substring(key.length + 1, tmp[0].length).replace(';', '')) || null;
-  }
-};
-
 document.addEventListener('statistics.accesslog', function(event) {
+
+  // Retrieve a cookie's value by key.
+  function getCookie(key) {
+    var tmp = document.cookie.match((new RegExp(key + '=[a-zA-Z0-9.()=|%/_]+($|;)', 'g')));
+    if (!tmp || !tmp[0]) {
+      return null;
+    }
+    else {
+      return unescape(tmp[0].substring(key.length + 1, tmp[0].length).replace(';', '')) || null;
+    }
+  };
+
   // Cache Status.
-  var cacheStatus = getCookieVal('Drupal.cache.status');
+  var cacheStatus = getCookie('Drupal.cache.status');
   if (cacheStatus == 'void' || cacheStatus == null) {
     event.data.cache = '';
   }