Form Post Across Two Sites Using Cross-Site Scripting XSS

Excellent programmer needed to design a XSS post so we can post product IDs, quantities and a few other variables to a 3rd party hosted shopping cart from a web store/web front end. Simple, we would like that when the user clicks on the "Add to Cart" button graphic (provided) that the variables are posted in the background without leaving the page and the button will change to an "Added to Cart" button graphic (provided). Above could normally be completed using JSON, JQuery and JQuery UI and I can provide similar code where it works if the front end and shopping cart were hosted together. The solution should be simple enough to implement and must work on all major browsers including IE, Safari, Firefox and Chrome. Provider should provide working code that I can implement on our site. Further details also provided via PM. BID REQUIREMENTS: -Generic bids will be rejected. Serious bidders only. -Please bid the time frame appropriately. -Please put the text "I have thoroughly read your project brief and project requirements" so I know you read the entire project description. -Please email me for additional information. -We own on generated work and all related copyrights.