function toggleMailingAddress() { // this is a single use function, it is not at all a generic function
	var mailTickets = document.getElementById('mailtickets').checked; 
	if (mailTickets) document.getElementById('mailingaddr').style.display = 'block';
	else document.getElementById('mailingaddr').style.display = 'none';
	calcTotal();
}

function togglePaymentForm() { // this is a single use function, it is not at all a generic function
	var paybycredit = document.getElementById('paybycredit').checked; 
	if (paybycredit) document.getElementById('paymentInfo').style.display = 'block';
	else document.getElementById('paymentInfo').style.display = 'none';
	calcTotal();
}