I am after some assistance with changing my image folder.

I had the issue of one or multiple people constantly either a robot leaching my images or referencing my images for another site to the point where I was constantly running out of bandwidth for my site. To counteract the issue I have had to rename my image directory.

I have changed the image directory using FTP and set permissions to 777
I have modified my configure.php file define('DIR_WS_IMAGES', 'movedimages/')

The site and everything seems to work fine until I go into the catalogue menu in the admin and then I get
Error: Catalog images directory does not exist: /home/sitename/public_html/shop/images/

Can someone either suggest another process to stop the use of my images or suggest how I can fix the error?