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();

function CheckCardNumber(form) {
  var tmpyear;
  if (document.orderform.card_no.value.length == 0) {
    alert("Please enter a Card Number.");
    document.orderform.card_no.focus();
    return false;
  }
  tmpyear = document.orderform.exp_year.options[document.orderform.exp_year.selectedIndex].value;
  tmpmonth = document.orderform.exp_month.options[document.orderform.exp_month.selectedIndex].value;
  // The following line doesn't work in IE3, you need to change it
  // to something like "(new CardType())...".
  // if (!CardType().isExpiryDate(tmpyear, tmpmonth)) {
  if (!(new CardType()).isExpiryDate(tmpyear, tmpmonth)) {
    alert("This card has already expired.");
    return false;
  }
  var card = document.orderform.card_type.options[document.orderform.card_type.selectedIndex].value;
  var cardcmd = card + ".checkCardNumber(\"" + document.orderform.card_no.value + "\", " + tmpyear + ", " + tmpmonth + ");"
  var retval = eval(cardcmd);
  var cardname = "";
  if (retval) {
    
    // comment this out if used on an order form
    //alert("This card number appears to be valid.");
    return true;
  
  } else {
    // 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(document.orderform.card_no.value, tmpyear, tmpmonth)) {
	cardname = Cards[n].getCardType();
	break;
      }
    }
    if (cardname.length > 0) {
      alert("This looks like a " + cardname + " number, not a " + card + " number.");
      return false;
    }
    else {
      alert("This card number is not valid.");
      return false;
    }
  }
}
/*************************************************************************\
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;
}

function checkAlpha(field) {// checks if input is a alphabetic
  var data = String(field.value);
  if (data == "") return true;

  for (var i=0; i < data.length; i++) {
    charcode = data.charCodeAt(i);
    if ( (charcode >= 64 && charcode <= 90) || //Capital letters
	 (charcode >= 97 && charcode <= 122) || // Lowercase letters 
	 charcode == 32 || //Spaces
	 charcode == 44 || // Comma
	 charcode == 46 ) // Period
      { 
	ok = true;
      } else {
	alert( field.name + " needs to be alphabetic");
	return false; 
      }
  }
  return true;
}

function checkAlphaNum(field) {// checks if input is a alphabetic
  var data = String(field.value);
  if (data == "") return true;

  for (var i=0; i < data.length; i++) {
    charcode = data.charCodeAt(i);

    if ( (charcode >= 48 && charcode <= 57) || //Set of numbers 
	 (charcode >= 64 && charcode <= 90) || //Capital letters
	 (charcode >= 97 && charcode <= 122) || // Lowercase letters 
	 charcode == 32 ) //Spaces
      { 
	ok = true;
      } else {
	alert( field.name + " needs to be alpha-numeric" );
	return false; 
      }
  }
  return true;
}

function checkName(field) {
  var data = String(field.value);
  if ( checkAlpha(field) ) {
    re = /^\w+.* \w+.*$/;
    if (re.test(data)) {
      return true;
    } else {
      alert("You must enter your first and last name");
      return false;
    }
  } else {
    return false;
  }
}

function checkCardCode(field) {// checks if input is a number
	/*
	for (var n = 0; n < Cards.size; n++) {
	  if (Cards[n].checkCardNumber(document.orderform.card_no.value, tmpyear, tmpmonth)) {
	cardname = Cards[n].getCardType();
	break;
	  }
	}
	*/
//	if (cardname == "MasterCard" || cardname == "VisaCard") {
	  var data = String(field.value);
	  if (data.length <= 2) {
	    alert("Invalid Security Code" + data.length);
	    return false;
	  }
	/*  
	for (var i=0; i < data.length; i++) {
	    charcode = data.charCodeAt(i);
	    if ( charcode >= 48 && charcode <= 57 )
	      { 
		ok = true;
	      } else {
		alert("Invalid Security Code");
		return false; 
	      }
	  }
	*/
//	}
  return true;
}


function checkAddress(field) { //Checks for a properly formatted phone number
  var data = String(field.value);
  re = /^\d+ .+$/;
  if (re.test(data)) {
    return true;
  } else {
    alert("Invalid Address");
    return false;
  }
}

function checkCity(field) {
  var data = String(field.value);
  if (data.length < 1) {
    alert("Please enter a city");
    return false;
  }
  return checkAlpha(field);
}


function checkZip(field) {// checks if input is a number
  var data = String(field.value);
  if (data.length != 5) {
    alert("Invalid Zip Code");
    return false;
  }
  for (var i=0; i < data.length; i++) {
    charcode = data.charCodeAt(i);
    if ( charcode >= 48 && charcode <= 57 )
      { 
	ok = true;
      } else {
	alert("Invalid Zip Code");
	return false; 
      }
  }
  return true;
}

function checkPhone(field) { //Checks for a properly formatted phone number
  var data = String(field.value);
  //re = /^\(\d{3}\) \d{3}-\d{4}$/;
  //if (re.test(data)) {
  //  return true;
  //} else {
  //  alert("Phone number should be of the form: (XXX) XXX-XXXX");
  //  return false;
  //}
  if(data!='') {
  	return true;
  } else {
    alert("You must enter a phone number.");
  	return false;
  }
}

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){
		   //alert("Invalid E-mail ID")
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   //alert("Invalid E-mail ID")
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		   // alert("Invalid E-mail ID")
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    //alert("Invalid E-mail ID")
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    //alert("Invalid E-mail ID")
		    return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    //alert("Invalid E-mail ID")
		    return false
		 }
		
		 if (str.indexOf(" ")!=-1){
		    //alert("Invalid E-mail ID")
		    return false
		 }

 		 return true					
	}

function checkEmail(emailID){
	if ((emailID.value==null)||(emailID.value=="")){
		alert("Please enter your email address")
		return false
	}
	if (echeck(emailID.value)==false){
		alert("Please enter a correct email address")
		return false
	}
	return true
 }


function checkState(field) {// checks if input is a alphabetic
  var data = String(field.value);
  if (data.length < 2) {
    alert("Invalid state");
    return false;
  }

  for (var i=0; i < data.length; i++) {
    charcode = data.charCodeAt(i);
    if ( (charcode >= 64 && charcode <= 90) || //Capital letters
	 (charcode >= 97 && charcode <= 122) || // Lowercase letters 
	 charcode == 32 ) //Spaces
      { 
	ok = true;
      } else {
	alert( field.name + " needs to be alphabetic");
	return false; 
      }
  }
  return true;
}

function checkFloat(field) {// checks if input is a flolat
  var data = String(field.value);
  if (data == "") return true;
  var valid = "0123456789.";     // are valid numbers or a "."
  var ok = 1; var checktemp;
  for (var i=0; i<data.length; i++) {
    checktemp = "" + data.substring(i, i+1);
    if (valid.indexOf(checktemp) == "-1") {
      alert( field.name + " is invalid");
      return false; 
    }
  }
  return true;
}

function checkInt(field) {// checks if input is a number
  var data = String(field.value);
  if (data == "") return true;
  var valid = "0123456789";     // are valid numbers or a "."
  var ok = 1; var checktemp;
  for (var i=0; i<data.length; i++) {
    checktemp = "" + data.substring(i, i+1);
    if (valid.indexOf(checktemp) == "-1") {
      alert( field.name + " is invalid");
      return false; 
    }
  }
  return true;
}


function validate() {
  with (document.forms[0]) {
    return (checkEmail(document.orderform.email) && 
	    checkName(document.orderform.full_name) &&
		CheckCardNumber(document.forms[0]) &&
	    checkCardCode(document.orderform.card_cvv) &&
	    //checkAddress(document.orderform.address1) &&
	    //checkAlphaNum(document.orderform.address2) &&
	    checkCity(document.orderform.city) &&
	    checkState(document.orderform.state) &&
	    //checkZip(document.orderform.zip) &&
	    checkPhone(document.orderform.phone)
	    );
  }
}

function checkNum(data) {// checks if all characters 
  if (data == "") return true;
  var valid = "0123456789";     // are valid numbers or a "."
  var ok = 1; var checktemp;
  for (var i=0; i<data.length; i++) {
    checktemp = "" + data.substring(i, i+1);
    if (valid.indexOf(checktemp) == "-1") {
      return false; 
    }
  }
  return true;
}