have you sorted this out yet?
best way is to drop a htacess in your root and allow requests from your domain only
RewriteEngine on
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^
http://www.yourdomain.com [NC]
RewriteCond %{HTTP_REFERER} !^
http://yourdomain.com [NC]
RewriteCond %{HTTP_REFERER} !^
http://your-ip [NC]
RewriteRule [^/]+\.(exe|mpeg|mpg|avi|mp3|gif|jpg|JPG|GIF|MP3|AVI|JS|js)$ - [F]
RewriteRule ^/cgi-bin/.+$ - [F]
AddHandler server-parsed html
ErrorDocument 404
http://www.yourdomain.com/404.htm