function updateCart() {
	if (validate() == true)	{
		var subTotal, tax, shipping, total;
		//var item1 = parseInt(document.checkoutForm.item1.value);
		var item2 = parseInt(document.checkoutForm.item2.value);
		//var price1 = parseFloat(document.checkoutForm.price1.value);
		var price2 = parseFloat(document.checkoutForm.price2.value);
		//var num = item1 + item2;
		var num = item2;
		
		//subTotal = item1 * price1 + item2 * price2;
		subTotal = item2 * price2;
		
		if (document.checkoutForm.va.checked == true) {
			tax = 0.045 * subTotal;
			tax = Math.round(100 * tax);
			tax = tax / 100;
		} else {
			tax = 0.00;
		}

		if (num >=1 && num <=2) {
			shipping = 4.00;	
		} else if (num >= 3 && num <= 6){
			shipping = 7.00;
		} else if (num == 0) {
			shipping = 0.00;
		} else {
			alert("If the you want more than 6 shirts, please e-mail to \nanthony.pecora@isletsupporter.com for postage charge.");
			return;
		}

		total = subTotal + tax + shipping;

		document.checkoutForm.subTotal.value = subTotal.toString();
		document.checkoutForm.tax.value = tax.toString();
		document.checkoutForm.shipping.value = shipping.toString();
		document.checkoutForm.total.value = total.toString();
	}
}

function validate() {
	//if (isPosInteger(document.checkoutForm.item1.value) == false) {
	//	alert("Please input a positive integer for item quantity!");
	//	return false;
	//}

	if (isPosInteger(document.checkoutForm.item2.value) == false) {
		alert("Please input a positive integer for item quantity!");
		return false;
	}

	return true;
}

function isPosInteger(inputStr) {
	for (var i =0;i <inputStr.length;i++) {
		var oneChar =inputStr.charAt(i);
		if (oneChar <"0" || oneChar >"9") {
			return false;
		}
	}
	return true;
}

function printOrder() {
	window.print();
}

function popupZoomIn(src) {
	window.open(src, 'zoomwin', 'height=640,width=660,toolbar=0,scrollbars=0,menubar=0,resizable=0,status=0');
}