need some help setting up Payment Gateway - Authorize.net

Hi, I need some help fast setting up a payment gateway, I'm pretty familiar with PHP, but not authorize.net's API. I don't need a whole shopping cart, really, i just need one page with some options on it, I can do the html form, but need help integrating it etc... Shouldn't be a lot of work for someone familiar with authorize.net. We can work out a deal, I might need some help on a couple other projects too, so if you are awesome and fast, I'll hook you up. PM me.