Index: common.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/common.inc,v
retrieving revision 1.1241
diff -u -p -r1.1241 common.inc
--- common.inc	16 Oct 2010 00:00:16 -0000	1.1241
+++ common.inc	18 Oct 2010 21:40:45 -0000
@@ -3329,7 +3329,7 @@ function drupal_build_css_cache($css) {
   $data = '';
   $uri = '';
   $map = variable_get('drupal_css_cache_files', array());
-  $key = hash('sha256', serialize($css));
+  $key = hash('sha256', variable_get('drupal_css_cache_version', 1) . serialize($css));
   if (isset($map[$key])) {
     $uri = $map[$key];
   }
@@ -4643,7 +4643,7 @@ function drupal_build_js_cache($files) {
   $contents = '';
   $uri = '';
   $map = variable_get('drupal_js_cache_files', array());
-  $key = hash('sha256', serialize($files));
+  $key = hash('sha256', variable_get('drupal_js_cache_version', 1) . serialize($files));
   if (isset($map[$key])) {
     $uri = $map[$key];
   }