if ( discountnum ) {
if ( form.pkgpart.options[form.pkgpart.selectedIndex].getAttribute('data-can_discount') == 1 ) {
form.discountnum.disabled = false;
if ( discountnum ) {
if ( form.pkgpart.options[form.pkgpart.selectedIndex].getAttribute('data-can_discount') == 1 ) {
form.discountnum.disabled = false;