272876 Change of Graphics

I have recently bought a script that needs to change a few things about the way it works. It has similar functionality as the one I need, so it won't be a big challenge to change. The script is like [login to view URL] but I need it changed to require people to register and have a free account before they can upload and share files with friends and family. We will need people to have 50MB of free space as a free account after which they will be required to pay for added space using PayPal or Google check out and an option of a third payment system. A very good typical example is www.box.net. Please look at it and if you can clone it to the detail of the graphics as well using the script I will provide.