function openWindow(url) {
	window.open(url, 'popup', 'resizable = 1, scrollbars = 1, top = 100, left = 100, width = 600, height = 550'); }
	
function hideDiv(id) {
	document.getElementById(id).style.visibility = 'hidden'; }

//function stopRKey(evt) {
//	var evt = (evt) ? evt : ((event) ? event : null);
//	var node = (evt.target) ? evt.target : ((evt.srcElement) ? evt.srcElement : null);
//	if ((evt.keyCode == 13) && (node.type=="text")) { return false; } }
//	document.onkeypress = stopRKey;

function copyBilling() {
	document.getElementById('shipping_address').value = document.getElementById('billing_address').value;
	document.getElementById('shipping_city').value = document.getElementById('billing_city').value;
	document.getElementById('shipping_province').value = document.getElementById('billing_province').value;
	document.getElementById('shipping_postal').value = document.getElementById('billing_postal').value;
	document.getElementById('shipping_country').value = document.getElementById('billing_country').value; };

function copyShipping() {
	document.getElementById('billing_address').value = document.getElementById('shipping_address').value;
	document.getElementById('billing_city').value = document.getElementById('shipping_city').value;
	document.getElementById('billing_province').value = document.getElementById('shipping_province').value;
	document.getElementById('billing_postal').value = document.getElementById('shipping_postal').value;
	document.getElementById('billing_country').value = document.getElementById('shipping_country').value; };

function copyEmail() {
	document.getElementById('billing_email_address').value = document.getElementById('email_address').value; };

function getMarkup() {
	var price 
	var cost
	price = Number(document.getElementById('price').value)
	cost = Number(document.getElementById('cost').value)
	markup = Number(((price - cost) / cost) * 100)
	document.getElementById('markup').value = markup }
	
function getPrice() {
	var cost
	var markup
	var price
	cost = Number(document.getElementById('cost').value)
	markup = Number(document.getElementById('markup').value)
	price = Number(cost + (cost * markup / 100))
	document.getElementById('price').value = price }

function formatNumber(obj) {
	obj.value=obj.value.replace(/(\d{3})(\d{3})/,'('+'$1'+') '+'$2'+'-') };

function copyText(content) {
	window.clipboardData.setData('Text',content); }

function checkLuhn(input) {
	var sum = 0;
	var numdigits = input.length;
	var parity = numdigits % 2;
	for(var i=0; i < numdigits; i++) {
	var digit = parseInt(input.charAt(i))
	if(i % 2 == parity) digit *= 2;
	if(digit > 9) digit -= 9;
	sum += digit; }
	return (sum % 10) == 0;	}