ErrorDocument 403 http://iweb.new21.org/potoz/403.html

SetEnvIF Referer "http://iweb.new21.org" pass 
SetEnvIF Referer "http://www.yahoo.com" pass
<FilesMatch ".(php)$"> 
Order deny,allow 
deny from all 
allow from env=pass 
ErrorDocument 403 http://iweb.new21.org/potoz/403.html 
</FilesMatch>

SetEnvIF Referer "http://iweb.new21.org" link_ok 
<FilesMatch ".(gif)$"> 
Order deny,allow 
deny from all 
allow from env=link_ok 
ErrorDocument 403 /do_link.gif 
</FilesMatch>

<FilesMatch ".(tar)$"> 
Order deny,allow 
deny from all 
allow from env=link_ok
ErrorDocument 403 http://iweb.new21.org/potoz/403.html 
</FilesMatch>