var Cards = new makeArray(8);
Cards[0] = new CardType("Master card", "51,52,53,54,55", "16");
var MasterCard = Cards[0];
Cards[1] = new CardType("Visa card", "4", "13,16");
var VisaCard = Cards[1];
Cards[2] = new CardType("AMEX card", "34,37", "15");
var AMEXCard = Cards[2];
Cards[3] = new CardType("Diners Club card", "30,36,38", "14");
var DinersClubCard = Cards[3];
Cards[4] = new CardType("Discover card", "6011", "16");
var DiscoverCard = Cards[4];
Cards[5] = new CardType("enRoute card", "2014,2149", "15");
var enRouteCard = Cards[5];
Cards[6] = new CardType("JCB card", "3088,3096,3112,3158,3337,3528", "16");
var JCBCard = Cards[6];
var LuhnCheckSum = Cards[7] = new CardType();


/////////////////
function CheckCardNumber_H(theForm) {
var tmpyear;



  if (theForm.ihexp_year.options[theForm.ihexp_year.selectedIndex].value > 1996)
    tmpyear = theForm.ihexp_year.options[theForm.ihexp_year.selectedIndex].value;
  else if (theForm.ihexp_year.options[theForm.ihexp_year.selectedIndex].value < 2021)
    tmpyear = theForm.ihexp_year.options[theForm.ihexp_year.selectedIndex].value;
  else {
    alert("The Expiration Year is not valid.");
    return false;
  }


  tmpmonth = theForm.ihexp_month.options[theForm.ihexp_month.selectedIndex].value;

  

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

  card = theForm.ihcc_type.options[theForm.ihcc_type.selectedIndex].value;

  var retval = eval(card + ".checkCardNumber(\"" + theForm.ihcc_number.value +
               "\", " + tmpyear + ", " + tmpmonth + ");");

  

  cardname = "";


  if (retval) {
    
    null;
  }
  else {
    

  for (var n = 0; n < Cards.size; n++) {
    if (Cards[n].checkCardNumber(theForm.ihcc_number.value, tmpyear, tmpmonth)) {
      cardname = Cards[n].getCardType();
      break;
   }
  }

  if (cardname.length > 0) {
    alert("This card number is not valid.");
    return false;
  }
  else {
    alert("This card number is not valid.");
    return false;
    }
  }

}

/////////////////////

function CheckCardNumber(theForm) {
var tmpyear;



  if (theForm.iexp_year.options[theForm.iexp_year.selectedIndex].value > 1996)
    tmpyear = theForm.iexp_year.options[theForm.iexp_year.selectedIndex].value;
  else if (theForm.iexp_year.options[theForm.iexp_year.selectedIndex].value < 2021)
    tmpyear = theForm.iexp_year.options[theForm.iexp_year.selectedIndex].value;
  else {
    alert("The Expiration Year is not valid.");
    return false;
  }


  tmpmonth = theForm.iexp_month.options[theForm.iexp_month.selectedIndex].value;

  

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

  card = theForm.icc_type.options[theForm.icc_type.selectedIndex].value;

  var retval = eval(card + ".checkCardNumber(\"" + theForm.icc_number.value +
               "\", " + tmpyear + ", " + tmpmonth + ");");

  

  cardname = "";


  if (retval) {
    
    null;
  }
  else {
    

  for (var n = 0; n < Cards.size; n++) {
    if (Cards[n].checkCardNumber(theForm.icc_number.value, tmpyear, tmpmonth)) {
      cardname = Cards[n].getCardType();
      break;
   }
  }

  if (cardname.length > 0) {
    alert("This card number is not valid.");
    return false;
  }
  else {
    alert("This card number is not valid.");
    return false;
    }
  }

}

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;  
  this.setCardType = setCardType;  
  this.setLen = setLen;  
  this.setRules = setRules;  
  this.setExpiryDate = setExpiryDate;  

  this.setCardType(tmpcardtype);
  this.setLen(tmplen);
  this.setRules(tmprules);

  if (argc > 4)
    this.setExpiryDate(argv[3], argv[4]);

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


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;
}

function getCardType() {
  return this.cardtype;
}


function getExpiryDate() {
  return this.month + "/" + this.year;
}


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;
}

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;
}

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;
}

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;
}

function makeArray(size) {
this.size = size;
return this;
}

function setCardNumber(cardnumber) {
this.cardnumber = cardnumber;
return this;
}

function setCardType(cardtype) {
this.cardtype = cardtype;
return this;
}

function setExpiryDate(year, month) {
  this.year = year;
  this.month = month;
  return this;
}

function setLen(len) {
  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;
}

function setRules(rules) {
  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;
}