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

function copyShippingToBilling() {
  $('bill_name_first').value = $F('ship_name_first');
  $('bill_name_last').value = $F('ship_name_last');
  $('bill_company').value = $F('ship_company');
  $('bill_address1').value = $F('ship_address1');
  $('bill_address2').value = $F('ship_address2');
  $('bill_city').value = $F('ship_city');
  $('bill_state').value = $F('ship_state');
  $('bill_postal_code').value = $F('ship_postal_code');
  $('bill_country').value = $F('ship_country');
  $('bill_phone').value = $F('ship_phone');
  $('bill_email').value = $F('ship_email');
}