function updateCart() {
   document.getElementById('formAction').value = 'updateCart';
   document.getElementById('mainForm').submit();
}

function copyShippingToBilling(ch) {
	var fields = ['name_first','name_last','company','address1','address2','city','state','postal_code','country','phone','email'];
	for (var i in fields)
	{
		with (document.getElementById('bill_' + fields[i])) {
			value = document.getElementById('ship_' + fields[i]).value;
			disabled = (ch.checked ? 'disabled' : '');
		}
	}
}