Add new Product Attribute to CRE Loaded Cart

We need to add the option to upload files to our server, but be able to control which products this option applies to. We think the best way to do this would be to add a new Product Attribute to our CRE Loaded OsCommerce B2B v 6.2 cart. It will need to be formatted to be used like the other Attributes/Additional Options of said cart. We need code written and installed. The code will allow a customer to upload a file that will be stored on our server that only we can access. The uploaded files will be photographs to be printed and framed by us and shipped to the customer. There is no need for the uploaded files to be posted on the website--that is not what we are interested in. The code will also need to include a button that allows the customer to browse their own computer for the file to be uploaded. We understand that this code is available for free from many different Ajax websites, but we need it to function as a part of the cart. We will give you temporary access to the cart and server when needed. If you can do this, please post a bid and we will contact you if it sounds fair. Thank you.