Oh my bad just from a certain domain the stuff I just posted was allowing only the domain typed in...here ya go. This should prevent the following domain from accessing the shown extensions.
Options +FollowSymLinks
RewriteEngine on
RewriteCond %{HTTP_REFERER} ^
http://(www\.)?domain.com/.*$ [NC]
RewriteRule \.(bmp|gif|jpg)$ - [F]