Calc 2.0

I have an interesting idea to create a plugin for developers that want easily include any kind of calculator on their webpage. Say you have hamburgers and drinks, that's how it may look like:

$.calc({
    "items": {
        "Burgers": {"Hamburger": "2.50", "Cheeseburger": "3.00", "Chickenburger": "3.50"},
        "Drinks": {"Soda": "1.00", "Cola": "1.50", "Beer": "1.75"},
        "Happy": false
        },
    "currency: "USD",
    "discount": "10",
    "type": "popup"
});

Script is supposed to create a web form with all this fields (directly on page or in popup)
Burgers: HamburgerCheeseburgerChickenburger
Drinks: SodaColaBeer
Happy:

Total:

I hope it will be same useful as other jQueryUI plugins that allow to pick dates or show tooltips