// JavaScript Document
function updatePrice(Change) {
	var Quantity = document.formNails.os1.value;
	if (Quantity == 0) {
		alert("Your Quantity Must Be Larger Than 0");
		Quantity = 1;
		document.formNails.os1.value = "1";
	}
	var Package = document.formNails.os0.value;
	var PackagePos = Package.indexOf("$");
	var iLen = String(Package).length;
	
	var PackagePrice = Right(Package,iLen-PackagePos-1);
	var TotalPrice = PackagePrice * Quantity;
	
	document.formNails.amount.value = TotalPrice;
	document.getElementById("subtotal").innerHTML = TotalPrice;
}
function Right(str, n) {
	if (n <= 0)
		return "";
		else if (n > String(str).length)
		return str;
		else {
		var iLen = String(str).length;
		return String(str).substring(iLen, iLen - n);
	}
}
function isNumberKey(evt) {
	var charCode = (evt.which) ? evt.which : event.keyCode
	if (charCode > 31 && (charCode < 48 || charCode > 57))
	return false;
	
	return true;
}