RewriteEngine on
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http://(www\.)?benimsite.com/.*$ [NC]
RewriteCond %{HTTP_REFERER} !^http://(subdomain\.)?benimsite.com/.*$ [NC]
RewriteRule \.(gif|jpg|js|css|bmp|waw|swf|png|mp3|avi|)$ - [F]