RewriteEngine On
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http://(.+\.)?postmodernbarney\.com/ [NC]
RewriteRule .(gif|jpg)$ - [F]
RewriteCond %{HTTP_REFERER} !q=cache

order allow, deny
deny from .4chan.org
allow from all