<a href="#" id="copy_from_billing">copy from billing</a>

%script
  $('#copy_from_billing').click(function() {
  $.each($('#piggybak_order_billing_address_attributes_field input'), function(i, el) {
  if($(el).attr('id') != 'piggybak_order_billing_address_attributes_id') {
  var shipping_id = $(el).attr('id').replace('billing', 'shipping');
  $('#' + shipping_id).val($(el).val());
  }
  });
  $('#piggybak_order_shipping_address_attributes_country_id').val($('#piggybak_order_billing_address_attributes_country_id').val());
  piggybak_states.update_state_option('shipping');
  $('#piggybak_order_shipping_address_attributes_state_id').val($('#piggybak_order_billing_address_attributes_state_id').val());
  return false;
  });