PHP coppermine alterations

1. The existing "no right click" script is not entirely preventing Mozilla firefox, Internet Explorer and Google Chrome brwosers from right clicking and saving images. This needs to be rectified or a better prevention method must be incorporated to disable theft of images. 2. I want guests to be able to register for memebrship that will allow them access to upload and trade images on the site. Memebership is to be set on a month to month subscribtion base. Guests must still be allowed to purchase images without registering for memebership. 3. Exisitng checkout process. Currently users must agree to the terms and conditions before they are able to register on the site. I want buyers to agree to those same terms and conditions before they purchase any image/s.