Auto Sum functions on a one page shopping form

I have had several projects on RAC/vWorker before but makes my first try with Freelancer now... I have a form where products are listed dynamically followed by order details. You can see the attached file which is also running on the server at [login to view URL] For each item it is possible to select an amount (Antal) to order. What I want help with is: 1. Create scripts that automatically calculates sum, shipping and total and shows the values on the page. 2. When the Send order button is clicked, The information about the ordered products ( do not include products with amount 0), sum, shipping, total and contact info will be sent by email by Jmail 4.4. The functions must be cross-browser. I think this is a very small job for a skilled javascript-coder.