# RewriteEngine On
# RewriteCond %{HTTP_REFERER} ^$ [OR]
# RewriteCond %{HTTP_REFERER} ^http://ime\.nu/
# RewriteRule ^.*$ - [F]

SetEnvIf REFERER ^$ BadReferer
SetEnvIf REFERER ^http://ime\.nu/ BadReferer
Order Allow,Deny
Allow from all
Deny from env=BadReferer
