<Files .htaccess>
order allow,deny
deny from all
</Files>

IndexIgnore */*
RewriteEngine on
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http://(www.)?domain.com/.*$ [NC]
RewriteRule .(gif|jpg|txt|xml|png)$ - [F]