php image watermarking

A clients site has some high quality hand made jewellery within it, and the client wants some form of protection to stop individuals lifting the images - so I am looking for someone who can implement an image watermarking script, right click protection etc and any other "trick" you know to stop them taking the images. The site uses dynamic images, pulled from a database, so the script will need to work on thumbnails (using a different watermark image) and the fullsize images. The site is http://fallers dot desk2web dot co dot uk