af/js/contact.js

function validate() {
	var valid = true;
	if($('#senderNameBox')[0].checkValidity() && $('#senderEmailBox')[0].checkValidity() && $('#messageBox')[0].checkValidity()) {
		$('#submitButton').prop('disabled', false);
	} else {
		$('#submitButton').prop('disabled', true);
	}
}

$(function() {
	var form = $('#theContactForm');
	H5F.setup([form[0]], {
		validClass: 'valid',
		invalidClass: 'invalid',
		requiredClass: 'required'
	});

	$.each([$('#senderNameBox'), $('#senderEmailBox'), $('#messageBox')], function(i,o) { $(o).keyup(validate) });
});