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("DSCVRCARD", "6011", "16");
var DSCVRCARD = 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();

/*************************************************************************\
CheckSequential - Checks the validators, one at a time
return the CardType object.
\*************************************************************************/
function checkEachField(src){
/* This fnction should ensure that one validation control is valid at a time*/
var genericId = src.id;
var specificId="";
var elemId = "";
var dummyElemId = "";
var retVal = true;
//Disable the dummyvalidator
dummyElemId = $get(src.id.replace('cardCustomValidator', 'myDummyValidator'));
ValidatorEnable(dummyElemId, false);

for(i=0;i<8;i++){
    switch(i){
    case 0: specificId = "tbxCardFName";break;
    case 1: specificId = "tbxCardLName"; break;
    case 2: specificId = "tbxCardNumber";break;
    case 3: specificId = "tbxExpDate";break;
    case 4: specificId = "tbxCVV";break;
    case 5: specificId = "tbxAddressLine1";break;
    case 6: specificId = "tbxCity";break;
    case 7: specificId = "tbxZIP";break;
    }
elemId = $get(src.id.replace('cardCustomValidator', specificId));
elemId.style.background = (elemId.value.length < 1) ?  '#FFFF00' : '#FFFFEE'; // highlight the field if empty
 
if(elemId.value.length < 1) retVal = false;
// focus on the current field and stay there if it turns out to be empty
if(!retVal){ elemId.focus();}
// Now check for special characters
//if(retVal) elemId.value =  elemId.value.replace([^a-zA-Z0-9/\ ],'');
//if(elemId.value.length < 1) retVal = false;

}
if(!retVal){
    ValidatorEnable(dummyElemId, true); // Enable the validator
    ValidatorValidate(dummyElemId); // eVALUATE THE VALIDATOR
}
return retVal;
}

/*************************************************************************\
CheckCardNumber(form)
function called when users click the "check" button.
\*************************************************************************/
function CheckCardNumber(source, arguments) {
var tmpyear;
var tbxCardNumber = $get(source.id.replace('cardCustomValidator', 'tbxCardNumber'));
var tbxExpDate = $get(source.id.replace('cardCustomValidator', 'tbxExpDate'));
var lstCardType = $get(source.id.replace('cardCustomValidator', 'lstCardType'));

// If all fields are NOT filled return true. It prevents the validator for lundt check from firing. 
// Since the validator for the dummyField is FALSE, the page is not "valid" and the callback associated with the validate button is NOT called!
if(!checkEachField(source)) return true; 

if(arguments.Value != "") {
arguments.IsValid = false;
this.ErrorMessage = arguments.Value;
return false;
}
tmpyear = "20" + tbxExpDate.value.substring(tbxExpDate.value.indexOf('/')+1);
tmpmonth = tbxExpDate.value.substring(0, tbxExpDate.value.indexOf('/'));

if (!(new CardType()).isExpiryDate(tmpyear, tmpmonth)) {
    arguments.IsValid = false;
    arguments.Value = "This card has already expired.";
    return;
}

card = lstCardType.options[lstCardType.selectedIndex].text;
card = card.toUpperCase();
card = card.replace(' ','');
card = card.replace('CARD', '') + 'CARD';

arguments.IsValid = eval(card + ".checkCardNumber(\"" + tbxCardNumber.value +
"\", " + tmpyear + ", " + tmpmonth + ");");
cardname = "";
    if (!arguments.IsValid) {
        // The cardnumber has the valid luhn checksum, but we want to know which
        // cardtype it belongs to.
        for (var n = 0; n < Cards.size; n++) {
            if (Cards[n].checkCardNumber(tbxCardNumber.value, tmpyear, tmpmonth)) {
                cardname = Cards[n].getCardType();
                break;
            }
        }
        if (cardname.length > 0) {
            arguments.Value = "This looks like a " + cardname + " number, not a " + card + " number.";
        }
        else {
            arguments.Value = "This card number is not valid.";
        }
    }
}
/*************************************************************************\
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;
}

/*************************************************************************\
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;
}

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

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

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

/*************************************************************************\
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;
}

/*************************************************************************\
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;
}

if(typeof(Sys) !== "undefined")
  Sys.Application.notifyScriptLoaded();