index.html - added error_header div for slide down effect when submitting the form with errors.
script.js - built custom submit function for form validation.  Also made error handling obj for functions to check certain input fields.
main.css - added .clear class, its always good to have a class setup for clearing.  Formatted radio button layout.

side note: I know adding jQuery may have been too much to add on something this small but I thought the slide effect on the form submission with errors is really cool!