#450032 by amariotti: change the expiration date of the credit card to xx/xx in the webform database; additionally, the 'x_card_code' is now a selectable field for mapping.
#450036 by amariotti: changed the way the component id #'s are looked up from an internal method to calling the webform function directly.  This prevents errors in mapping the field name to the numeric key in the submitted array.
New feature: the error messages from authorize.net are now used, so that it is more clear to the end user what the specific problem is with their credit card.