function change_payment_type(){
	var myArray = new Array(nal, perevod_2, chastnlica_3, creditcard_4);
	for (i = 0; i < myArray.length; i++){
		if (i == order_form.paymenttype.value - 1){
			myArray[i].style.display = '';
		}else{
			myArray[i].style.display = 'none';
		}
	}
}