RewriteEngine On RewriteCond %{REQUEST_FILENAME} .*jpg$|.*jpeg$|.*bmp$|.*gif$|.*png$ [NC] RewriteCond %{HTTP_REFERER} !^$ RewriteCond %{HTTP_REFERER} !^http://(.+\.)?exampledomain1 [NC] RewriteCond %{HTTP_REFERER} !^http://(.+\.)?exampledomain2 [NC] RewriteRule (.*) /path/to/custom/script.php?src=$1