File Server Folder Permissions Help

We have a Win 2k3 server that we are using as a file server for various documents (.doc,.xls,.pdf) for all of our clients. We have a main folder (Master Client) with subfolders for every client we have. The issue we are having is that people have full control and can and do offten move the folders into a different client. Then when you need to find the client folder you cannot. Is there anyway that we can limit the ability to move folders through the permissions? If so how? I know I cannot limit the delete, but that is all that I can find. Thanks guys you will be helping out big time!!!!