Updated runtime files.
diff --git a/runtime/syntax/javascript.vim b/runtime/syntax/javascript.vim
index ba90666..1b20f98 100644
--- a/runtime/syntax/javascript.vim
+++ b/runtime/syntax/javascript.vim
@@ -22,6 +22,8 @@
     finish
   endif
   let main_syntax = 'javascript'
+elseif exists("b:current_syntax") && b:current_syntax == "javascript"
+  finish
 endif
 
 let s:cpo_save = &cpo