Hotlinking removal

RewriteEngine on
RewriteCond %{HTTP_REFERER} .
RewriteCond %{HTTP_REFERER} !^http://(www\.)?yoursite\.com [NC]
RewriteRule \.(gif¦jpe?g)$ – [NC,F]

from http://www.webmasterworld.com/forum23/3763.htm

Need to add someday.