var Cards = new makeArray(8);

Cards[0] = new CardType("MasterCard", "51,52,53,54,55", "16");
var MasterCard = Cards[0];

Cards[1] = new CardType("VisaCard", "4", "13,16");
var VisaCard = Cards[1];

Cards[2] = new CardType("AmExCard", "34,37", "15");
var AmExCard = Cards[2];

Cards[3] = new CardType("DinersClubCard", "30,36,38", "14");
var DinersClubCard = Cards[3];

Cards[4] = new CardType("DiscoverCard", "6011", "16");
var DiscoverCard = Cards[4];

Cards[5] = new CardType("enRouteCard", "2014,2149", "15");
var enRouteCard = Cards[5];

Cards[6] = new CardType("JCBCard", "3088,3096,3112,3158,3337,3528", "16");
var JCBCard = Cards[6];

var LuhnCheckSum = Cards[7] = new CardType();

/*************************************************************************\
CheckCardNumber(form)
function called when users click the "check" button.
\*************************************************************************/
function CheckCardNumber() {
	var tmpyear;
	var tmpmonth;
	var cardname = "";
	
	
	tmpyear = Number(document.ShopForm.ExpireYear.options[document.ShopForm.ExpireYear.selectedIndex].value) + 2000;
	tmpmonth = document.ShopForm.ExpireMonth.options[document.ShopForm.ExpireMonth.selectedIndex].value;
	if (!(new CardType()).isExpiryDate(tmpyear, tmpmonth)) {
		alert("This card has already expired.");
		return false;
	}
	
	for (var n = 0; n < Cards.size; n++) {
		if (Cards[n].checkCardNumber(document.ShopForm.CardNumber.value, tmpyear, tmpmonth)) {
			cardname = Cards[n].getCardType();
			break;
		}
	}
		
	if (!((cardname.length > 0) && (eval(cardname + ".checkCardNumber(\"" + document.ShopForm.CardNumber.value + "\", " + tmpyear + ", " + tmpmonth + ");")))) {
		alert("This card number is not valid.");
		return false;
	}

	return true;
}
/*************************************************************************\
Object CardType([String cardtype, String rules, String len, int year, 
                                        int month])
cardtype    : type of card, eg: MasterCard, Visa, etc.
rules       : rules of the cardnumber, eg: "4", "6011", "34,37".
len         : valid length of cardnumber, eg: "16,19", "13,16".
year        : year of expiry date.
month       : month of expiry date.
eg:
var VisaCard = new CardType("Visa", "4", "16");
var AmExCard = new CardType("AmEx", "34,37", "15");
\*************************************************************************/
function CardType() {
var n;
var argv = CardType.arguments;
var argc = CardType.arguments.length;

this.objname = "object CardType";

var tmpcardtype = (argc > 0) ? argv[0] : "CardObject";
var tmprules = (argc > 1) ? argv[1] : "0,1,2,3,4,5,6,7,8,9";
var tmplen = (argc > 2) ? argv[2] : "13,14,15,16,19";

this.setCardNumber = setCardNumber;  // set CardNumber method.
this.setCardType = setCardType;  // setCardType method.
this.setLen = setLen;  // setLen method.
this.setRules = setRules;  // setRules method.
this.setExpiryDate = setExpiryDate;  // setExpiryDate method.

this.setCardType(tmpcardtype);
this.setLen(tmplen);
this.setRules(tmprules);
if (argc > 4)
this.setExpiryDate(argv[3], argv[4]);

this.checkCardNumber = checkCardNumber;  // checkCardNumber method.
this.getExpiryDate = getExpiryDate;  // getExpiryDate method.
this.getCardType = getCardType;  // getCardType method.
this.isCardNumber = isCardNumber;  // isCardNumber method.
this.isExpiryDate = isExpiryDate;  // isExpiryDate method.
this.luhnCheck = luhnCheck;// luhnCheck method.
return this;// 1
}

/*************************************************************************\
boolean checkCardNumber([String cardnumber, int year, int month])
return true if cardnumber pass the luhncheck and the expiry date is
valid, else return false.
\*************************************************************************/
function checkCardNumber() {
var argv = checkCardNumber.arguments;
var argc = checkCardNumber.arguments.length;
var cardnumber = (argc > 0) ? argv[0] : this.cardnumber;
var year = (argc > 1) ? argv[1] : this.year;
var month = (argc > 2) ? argv[2] : this.month;

this.setCardNumber(cardnumber);
this.setExpiryDate(year, month);

if (!this.isCardNumber())
return false;
if (!this.isExpiryDate())
return false;

return true;
}
/*************************************************************************\
String getCardType()
return the cardtype.
\*************************************************************************/
function getCardType() {
return this.cardtype;
}
/*************************************************************************\
String getExpiryDate()
return the expiry date.
\*************************************************************************/
function getExpiryDate() {
return this.month + "/" + this.year;
}
/*************************************************************************\
boolean isCardNumber([String cardnumber])
return true if cardnumber pass the luhncheck and the rules, else return
false.
\*************************************************************************/
function isCardNumber() {
var argv = isCardNumber.arguments;
var argc = isCardNumber.arguments.length;
var cardnumber = (argc > 0) ? argv[0] : this.cardnumber;
if (!this.luhnCheck())
return false;

for (var n = 0; n < this.len.size; n++)
if (cardnumber.toString().length == this.len[n]) {
for (var m = 0; m < this.rules.size; m++) {
var headdigit = cardnumber.substring(0, this.rules[m].toString().length);
if (headdigit == this.rules[m])
return true;
}
return false;
}
return false;
}

/*************************************************************************\
boolean isExpiryDate([int year, int month])
return true if the date is a valid expiry date,
else return false.
\*************************************************************************/
function isExpiryDate() {
var argv = isExpiryDate.arguments;
var argc = isExpiryDate.arguments.length;

year = argc > 0 ? argv[0] : this.year;
month = argc > 1 ? argv[1] : this.month;

if (!isNum(year+""))
return false;
if (!isNum(month+""))
return false;
today = new Date();
expiry = new Date(year, month);
if (today.getTime() > expiry.getTime())
return false;
else
return true;
}

/*************************************************************************\
boolean isNum(String argvalue)
return true if argvalue contains only numeric characters,
else return false.
\*************************************************************************/
function isNum(argvalue) {
argvalue = argvalue.toString();

if (argvalue.length == 0)
return false;

for (var n = 0; n < argvalue.length; n++)
if (argvalue.substring(n, n+1) < "0" || argvalue.substring(n, n+1) > "9")
return false;

return true;
}

/*************************************************************************\
boolean luhnCheck([String CardNumber])
return true if CardNumber pass the luhn check else return false.
Reference: http://www.ling.nwu.edu/~sburke/pub/luhn_lib.pl
\*************************************************************************/
function luhnCheck() {
var argv = luhnCheck.arguments;
var argc = luhnCheck.arguments.length;

var CardNumber = argc > 0 ? argv[0] : this.cardnumber;

if (! isNum(CardNumber)) {
return false;
  }

var no_digit = CardNumber.length;
var oddoeven = no_digit & 1;
var sum = 0;

for (var count = 0; count < no_digit; count++) {
var digit = parseInt(CardNumber.charAt(count));
if (!((count & 1) ^ oddoeven)) {
digit *= 2;
if (digit > 9)
digit -= 9;
}
sum += digit;
}
if (sum % 10 == 0)
return true;
else
return false;
}

/*************************************************************************\
ArrayObject makeArray(int size)
return the array object in the size specified.
\*************************************************************************/
function makeArray(size) {
this.size = size;
return this;// 2
}

/*************************************************************************\
CardType setCardNumber(cardnumber)
return the CardType object.
\*************************************************************************/
function setCardNumber(cardnumber) {
this.cardnumber = cardnumber;
return this;// 3
}

/*************************************************************************\
CardType setCardType(cardtype)
return the CardType object.
\*************************************************************************/
function setCardType(cardtype) {
this.cardtype = cardtype;
return this;// 4
}

/*************************************************************************\
CardType setExpiryDate(year, month)
return the CardType object.
\*************************************************************************/
function setExpiryDate(year, month) {
this.year = year;
this.month = month;
return this;// 5
}

/*************************************************************************\
CardType setLen(len)
return the CardType object.
\*************************************************************************/
function setLen(len) {
	// Create the len array.
	if (len.length == 0 || len == null)
		len = "13,14,15,16,19";
	
	var tmplen = len;
	n = 1;
	while (tmplen.indexOf(",") != -1) {
		tmplen = tmplen.substring(tmplen.indexOf(",") + 1, tmplen.length);
		n++;
	}
	this.len = new makeArray(n);
	n = 0;
	while (len.indexOf(",") != -1) {
		var tmpstr = len.substring(0, len.indexOf(","));
		this.len[n] = tmpstr;
		len = len.substring(len.indexOf(",") + 1, len.length);
		n++;
	}
	this.len[n] = len;
	return this;// 6
}

/*************************************************************************\
CardType setRules()
return the CardType object.
\*************************************************************************/
function setRules(rules) {
	// Create the rules array.
	if (rules.length == 0 || rules == null)
	rules = "0,1,2,3,4,5,6,7,8,9";
	  
	var tmprules = rules;
	n = 1;
	while (tmprules.indexOf(",") != -1) {
		tmprules = tmprules.substring(tmprules.indexOf(",") + 1, tmprules.length);
		n++;
	}
	this.rules = new makeArray(n);
	n = 0;
	while (rules.indexOf(",") != -1) {
		var tmpstr = rules.substring(0, rules.indexOf(","));
		this.rules[n] = tmpstr;
		rules = rules.substring(rules.indexOf(",") + 1, rules.length);
		n++;
	}
	this.rules[n] = rules;
	return this;// 7
}


function echeck(str) {

		var at="@"
		var dot="."
		var lat=str.indexOf(at)
		var lstr=str.length
		var ldot=str.indexOf(dot)
		 if (str.indexOf(at)==-1) return false;

		 if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr) return false;

		 if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr) return false;

		 if (str.indexOf(at,(lat+1))!=-1) return false;
		 
		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot) return false;

		 if (str.indexOf(dot,(lat+2))==-1) return false;
		
		 if (str.indexOf(" ")!=-1) return false;
		 
 		 return true;					
	}


function checkzip(str)
{
	if (str.length == 0) return true;

	if (str.length != 5 && str.length != 10) return false;

	if (str.charAt(0) == "-" || str.charAt(0) == "+") return false;

	if (str.length == 5) return true;

	if (str.charAt(5) != "-" && str.charAt(5) != " ") return false;

	return true;
}

function isValidDate(dateStr) {
// MM/DD/YY   MM/DD/YYYY   MM-DD-YY   MM-DD-YYYY
	
	var datePat = /^(\d{1,2})(\/|-)(\d{1,2})\2(\d{2,4})$/; // requires 4 digit year
	
	var matchArray = dateStr.match(datePat); // is the format ok?
	if (matchArray == null) {
	alert(dateStr + " is not in a valid format. Please enter date in mm/dd/yyyy format");
	return false;
	}
	month = matchArray[1]; // parse date into variables
	day = matchArray[3];
	year = matchArray[4];
	
	// Put year in thousands format.
	// LT 10 is 2000's, GT 30 is 1900's Anything in between is obscure.
	if (year < 100) {
		if 		(year < 20) year = parseInt(year) + 2000;
		else if (year > 40) year = parseInt(year) + 1900;
		else {   
			alert("We can not tell if " + dateStr + " is in this millenium, or the last.\nPlease enter the year in the full 4 digit format.");
			return false;
		}
	}
	
	if (month < 1 || month > 12) { // check month range 
	alert("Month must be between 1 and 12.");
	return false;
	}
	if (day < 1 || day > 31) {
	alert("Day must be between 1 and 31.");
	return false;
	}
	if ((month==4 || month==6 || month==9 || month==11) && day==31) {
	alert("Month "+month+" doesn't have 31 days!");
	return false;
	}
	if (month == 2) { // check for february 29th
	var isleap = (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0));
	if (day>29 || (day==29 && !isleap)) {
	alert("February of " + year + " doesn't have " + day + " days!\nPlease re-enter the correct date.");
	return false;
	  }
	}
	
	var d = new Date();
	var thisyear = d.getFullYear();
	var thismonth = d.getMonth();
	if (year > (thisyear - 19)){
		if (year > (thisyear - 18)){
		alert("The date of birth entered does not make you 18!\nPlease re-enter the correct date, or cancel this order.");
		return false;
		}
		else if (thismonth - month < 0) {
		alert("The date of birth entered does not make you 18!\nPlease re-enter the correct date, or cancel this order.");
		return false;
		}
	}
	
	
	return true;
}

function getCheckedValue(radioObj) {
	if(!radioObj)
		return "";
	var radioLength = radioObj.length;
	if(radioLength == undefined)
		if(radioObj.checked)
			return radioObj.value;
		else
			return "";
	for(var i = 0; i < radioLength; i++) {
		if(radioObj[i].checked) {
			return radioObj[i].value;
		}
	}
	return "";
}
	
function ValidateForm(){

	if ((document.ShopForm.ship_name.value == null) || (document.ShopForm.ship_name.value == "")){
		alert("Please enter the recipient's name in the [Recipient's Name] field. Without this information, your order may not be properly delivered.");
		document.ShopForm.ship_name.focus();
		return false;
	}
	
	if ((document.ShopForm.ship_address1.value == null) || (document.ShopForm.ship_address1.value == "")){
		alert("Please specify the address to which you would like delivery.")
		document.ShopForm.ship_address1.focus();
		return false;
	}
	
	if ((document.ShopForm.ship_city.value == null) || (document.ShopForm.ship_city.value == "")){
		alert("Please specify the city, state and zip code.")
		document.ShopForm.ship_city.focus();
		return false;
	}
		
	if ((document.ShopForm.ship_phone.value == null) || (document.ShopForm.ship_phone.value == "")){
		alert("Please enter a phone number where we may reach you directly in case there is an issue!");
		document.ShopForm.ship_phone.focus();
		return false;
	}
	
	if ((document.ShopForm.pay_cardholder.value == null) || (document.ShopForm.pay_cardholder.value == "")){
		alert("Please enter the full name of the credit card owner in the [Cardholder] field!");
		document.ShopForm.pay_cardholder.focus();
		return false;
	}
			
	if ((document.ShopForm.pay_cardnumber.value == null) || (document.ShopForm.pay_cardnumber.value == "")){
		alert("You must enter a credit card number to complete the purchase!");
		document.ShopForm.pay_cardnumber.focus();
		return false;
	}
	
	if (document.ShopForm.pay_expiremonth.options[document.ShopForm.pay_expiremonth.selectedIndex].value == ''){
		alert("Please select the expiration month on the credit card!");
		document.ShopForm.pay_expiremonth.focus();
		return false;
	}
		
	if (document.ShopForm.pay_expireyear.options[document.ShopForm.pay_expireyear.selectedIndex].value == ''){
		alert("Please select the year of expiration on your credit card!");
		document.ShopForm.pay_expireyear.focus()
		return false;
	}
	
	if ((document.ShopForm.pay_email.value == null) || (document.ShopForm.pay_email.value == "")){
		alert("Please enter an email address! We need it to mail you a receipt.");
		document.ShopForm.pay_email.focus();
		return false;
	}
	
	if (echeck(document.ShopForm.pay_email.value)==false){
		alert("You have entered an invalid Email Address!");
		document.ShopForm.Email.focus()
		return false;
	}
	
	if (CheckCardNumber() == false){
		document.ShopForm.pay_cardnumber.focus()
		return false;
	}	
  
  return true;
}

function numonly(e){
var code;
if (!e) var e = window.event;
if (e.keyCode) code = e.keyCode;
else if (e.which) code = e.which;
var character = String.fromCharCode(code);
//alert(’Character was ‘ + character);
    //alert(code);
    //if (code ==  return true;
    var AllowRegex  = /^[\t\b0-9]$/;
    if (AllowRegex.test(character)) return true;     
    return false; 
}