Implement PHP shopping cart

I have just gotten designed a jquery-bootstrap-checkout page-mockup, where all the action happens in one dynamic page by hiding panels with jquery/js. It allows me to navigate from page to page without any page-refresh and looks visually smart. NOTE: Only one day to finish if you bid on this! Urgent. See the attached [login to view URL] and [login to view URL] for screenshots. Before, I used normal http post to refresh the page and where the user was redirected to the next step. My query/javascripts skills is bad and I need help to convert/implement this new method. You must make the entire shopping-cart/ordering/signup work (connect it to PHP/MySQL if you will), from shopping-cart to complete order. All the traditional server-side PHP code is there in that one file. But I'm sure you have to do at least some customize of PHP to be able to call/communicate between the new dynamic form and PHP! This software is custom software, it is NOT magento, wordpress or similar. It is actually easier/less complex in my view since it is only one PHP file and only one HTML-file. I'm using Smarty for template-engine (so that PHP and html/js is seperate and easier for webdesigners to use). You must connect [login to view URL] and [login to view URL] and make sure order checkout, quantity updates and every function in the working html-jqery-mockup works from A to Z in a nice way. I have attached a screenshot the most central code-parts from the PHP-file here. I can't afford to let you use more than 1 (one) day on this project. You must work directly on my FTP-site (because the db-backend is complicated to move). I assume this is a 4-6 hour job for a skilled jquery/PHP-developer - this includes the time to get familiar with the one page php-script. The html/jquery is completely new and works like a demo of the functionality.