RewriteEngine on
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http://domain.com/.*$ [NC]
RewriteCond %{HTTP_REFERER} !^http://www.domain.com/.*$ [NC]
RewriteCond %{REQUEST_URI} !^/okay_image\.jpg
RewriteCond %{REQUEST_URI} !^/okay_image2\.gif
RewriteCond %{REQUEST_URI} !^/another/okay_image3\.jpg
RewriteCond %{REQUEST_URI} !^/final/okay_image\.gif
RewriteRule .*\.(jpg|gif)$ - [F]
Unfortunatley, that code is wrong... it should be:
RewriteCond %{HTTP_REFERER} !^http://domain\.com/.*$ [NC]
RewriteCond %{HTTP_REFERER} !^http://www\.domain\.com/.*$ [NC]
as it correctly states further down the page. Not a major change :)