Authorize.net Automatic Recurring Billing Ecommerce

I have a website that I have to add the option for a user to sign up and pay on a subscription basis. I would like to use authorize.net as the processor.

I will need to have about 5 different subscription plans to choose from.

Here is a link to the guide for doing what I need on authorize.net:

http://www.authorize.net/support/ARB_guide.pdf

Thank you!