[Plugin: WP Super Cache] – adding max-age for images/css

Hi,

I use the mod-rewrite option in WP Super Cache, it seems to work.

As the plugin does not add expiry dates or max-age for images or css, I modified the .htaccess file in the cache folder (wp-content/cache/) manually and added max-ages for images and css. (I cannot use the expiry module with my virtual server, so I cannot add expiry dates.)

I added the following code to the .htaccess file in the cache folder:

# BEGIN Cache-Control Headers
<ifmodule mod_headers.c>
  <filesmatch "\.(flv|gif|jpg|jpeg|png|ico|swf)$">
        Header set Cache-Control "max-age=86400"
  </filesmatch>
  <filesmatch "\.(css|pdf)$">
        Header set Cache-Control "max-age=86400"
  </filesmatch>
  <filesmatch "\.(js)$">
        Header set Cache-Control "max-age=86400, private"
  </filesmatch>
</ifmodule>

The whole file now looks like this:
http://pastebin.com/B4WGnTjM

But when I check the browser caching of static assets, I still get the message: No max-age or expires for the images and the css file.

Can anyone please help?
Many thanks in advance.