prueba este codigo para ver si te sirve (extraido del cpanel ^^)
Cita: RewriteEngine on
RewriteCond %{HTTP_REFERER}
!^http://draken-xtreme.com/.*$ [NC]
RewriteCond %{HTTP_REFERER}
!^http://draken-xtreme.com$ [NC]
RewriteCond %{HTTP_REFERER}
!^http://www.draken-xtreme.com/.*$ [NC]
RewriteCond %{HTTP_REFERER}
!^http://www.draken-xtreme.com$ [NC]
RewriteRule .*\.(jpg|jpeg|gif|png|bmp)$ - [F,NC]