AUTHORIZE.NET checkout & UPS.com Shipping programmed ASAP!!!!!

I NEED to program my checkout page so i can process credit cards ASAP!!!! This must be done within a few hours or no more than 2 days. Page went down for some reason and i cant get orders from site. HELP!!!!!!!!!! My merchant is [login to view URL] and this has a budget of less than $100. Thank you. I also need a [login to view URL] shipping calculator processed ASAP! I would like to be able to ad an additional percentage to shipping as well. This can be done through the back end code. No need for admin or anything.