Version 2 API only.

`setShippingChoice`

Method Signature	void ultraCart.setShippingChoice(String selectedShippingMethod);
Description	This is a convenience method for setting the shipping choice on the cart. It does the following: updates the cart.shippingMethod property fires shippingchange event updates the cart asynchronously (but does not fire the usual cartchange event here!)
Parameter	String selectedShippingMethod - the name of the shipping method chosen by the customer
Result	no return value

// imagine the shipping methods listed out as radio buttons ...
jQuery('[name=shippingMethod]').bind('click.ultraCart', chooseShipping);
function chooseShipping() {
  ultraCart.setShippingChoice(jQuery('[name=shippingMethod]:checked').val());
}

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