RewriteEngine on
RewriteCond %{HTTP_REFERER} !^http://(www.)?3sfoor.net/.*$ [NC]
RewriteRule .(rar|RAR|ZIP|zip|wav|rm|mp3|flv|ram|mpeg|avi|3gp|swf|WAV|RM|MP3|FLV|RAM|MPEG|AVI|3GP|SWF)$ http://www.3sfoor.net [R,L]