I'm not sure if this module is working for me

The site in question is www.after-hours-japan.com

I have created six subdomains, img1[-6].after-hours-japan.com
I added the rules to my .htaccess file, changing 'drupal.org' to 'after-hours-japan.com'.

But when I use firebug, and I checkout the net panel (which lists all the downloaded assets), all the assets seem to come from the www domain, instead of the sub domains. Am I doing something wrong?

Regards and thank you.