var Cards = new makeArray(5);
		Cards[0] = new CardType("Visa", "4", "13,16");
		//Cards[0] = new CardType("0", "4", "13,16");
		var Visa = Cards[0];
		
		Cards[1] = new CardType("MasterCard", "51,52,53,54,55", "16");
		//Cards[1] = new CardType("1", "51,52,53,54,55", "16");
		var MasterCard = Cards[1];
		
		Cards[2] = new CardType("AmericanExpress", "34,37", "15");
		//Cards[2] = new CardType("2", "34,37", "15");
		var AmericanExpress = Cards[2];
		
		Cards[3] = new CardType("Discover", "6011", "16");
		//Cards[3] = new CardType("3", "6011", "16");
		var Discover = Cards[3];
		
		Cards[4] = new CardType("PurchaseOrder", " ", " ");
		//Cards[4] = new CardType("4", " ", " ");
		var PurchaseOrder = Cards[4];
   
       //var PurchaseOrder = Cards[4]=new CardType();
	  
//***********************************************************************
function CheckCardNumber(form) 

{
	
	//**********************************************************************
	 if (form.CardType.options[form.CardType.selectedIndex].value == "PurchaseOrder")
	{
		//alert ('This must be exit');
		document.forms["ThisForm"].submit();
		return false;
	 }

	//***********************************************************************	
	var tmpyear;
	if (form.CardNumber.value.length == 0)
	 {
		alert("Please enter a Card Number.");
		form.CardNumber.focus();
		return ;
	}
	
	if (form.ExpYear.value.length == 0)                           // CardExpiration
	{
	alert("Please enter the Expiration Year.");
	form.ExpYear.focus();
	return ;
	}
	  
	if (form.ExpYear.value > 96)                                 // CardExpiration
		tmpyear = "19" + form.ExpYear.value;
	else if (form.ExpYear.value < 21)							// CardExpiration
		tmpyear = "20" + form.ExpYear.value;
	else 
	 {
		alert("The Expiration Year is not valid.");
		return ;
	 }
		tmpmonth = form.ExpMon.options[form.ExpMon.selectedIndex].value;             // CardExpiration


if (!(new CardType()).isExpiryDate(tmpyear, tmpmonth)) 
 {
  alert("This card has already expired.");
  return  ;
 }
 
	card = form.CardType.options[form.CardType.selectedIndex].value;
//************************************************************************	 
	 if (card == ("PurchaseOrder")) 
	   {
	     document.ThisForm.submit();
 	   }
 //********************************************************	
 	var retval = eval(card + ".checkCardNumber(\"" + form.CardNumber.value +
	"\", " + tmpyear + ", " + tmpmonth + ");");
	cardname = "";
   if (retval)
	//alert("This card number appears to be valid.");
	// return ;
	document.ThisForm.submit();
	
else
    {
      for (var n = 0; n < Cards.size; n++) 
		{
			if (Cards[n].checkCardNumber(form.CardNumber.value, tmpyear, tmpmonth))
			 {
				cardname = Cards[n].getCardType();
				break;
			 }
		 }

            if (cardname.length > 0)
             {
				alert("This looks like a " + cardname + " number, not a " + card + " number.");
			 }
            else 
             {
               alert("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;
}


function createExpDate(form) {

	m= form.ExpMon.options[form.ExpMon.selectedIndex].value;
	y= form.ExpYear.value;
	
	form.x_Exp_Date.value=m+y;
	
}

function createCardNum(form) {


	n= form.CardNumber.value;

	form.x_Card_Num.value=n;

}

function copyBillTo(theForm)
{
	if (theForm.use_bill_to.checked==true)
	{
		theForm.shipToFName.value = theForm.billToFName.value;
		theForm.shipToLName.value = theForm.billToLName.value;
		theForm.shipToCompany.value = theForm.billToCompany.value;
		theForm.shipToStreet1.value = theForm.billToStreet1.value;
		theForm.shipToStreet2.value = theForm.billToStreet2.value;
		theForm.shipToCity.value = theForm.billToCity.value;
		theForm.shipToState.value = theForm.billToState.value;
		theForm.shipToPostal.value = theForm.billToPostal.value;
		theForm.shipToPhoneAC.value = theForm.billToPhoneAC.value;
		theForm.shipToPhonePRE.value = theForm.billToPhonePRE.value;
		theForm.shipToPhoneSUF.value = theForm.billToPhoneSUF.value;
	}
}
function validateValues(theForm) {

	if (validateValue(theForm.billToFName, 1, 32, "bill to first name")==false) return false;
	if (validateValue(theForm.billToLName, 1, 32, "bill to last name")==false) return false;
	if (validateValue(theForm.billToStreet1, 1, 32, "bill to address")==false) return false;
	if (validateValue(theForm.billToCity, 1, 32, "bill to city")==false) return false;
	if (validateValue(theForm.billToState, 1, 32, "bill to state")==false) return false;
	if (validateValue(theForm.billToPostal, 5, 13, "bill to zip code")==false) return false;
	if (validateValue(theForm.billToCountry, 1, 32, "bill to country")==false) return false;
	if (validateValue(theForm.billToPhoneAC, 3, 3, "bill to phone")==false) return false;
	if (validateValue(theForm.billToPhonePRE, 3, 3, "bill to phone")==false) return false;
	if (validateValue(theForm.billToPhoneSUF, 4, 4, "bill to phone")==false) return false;
	if (validateValue(theForm.emailAddress, 3, 50, "email address")==false) return false;

	if (validateValue(theForm.shipToFName, 1, 32, "ship to first name")==false) return false;
	if (validateValue(theForm.shipToLName, 1, 32, "ship to last name")==false) return false;
	if (validateValue(theForm.shipToStreet1, 1, 32, "ship to address")==false) return false;
	if (validateValue(theForm.shipToCity, 1, 32, "ship to city")==false) return false;
	if (validateValue(theForm.shipToState, 1, 32, "ship to state")==false) return false;
	if (validateValue(theForm.shipToPostal, 5, 13, "ship to zip code")==false) return false;
	if (validateValue(theForm.shipToCountry, 1, 32, "ship to country")==false) return false;
	if (validateValue(theForm.shipToPhoneAC, 3, 3, "ship to phone")==false) return false;
	if (validateValue(theForm.shipToPhonePRE, 3, 3, "ship to phone")==false) return false;
	if (validateValue(theForm.shipToPhoneSUF, 4, 4, "ship to phone")==false) return false;
	if (validateValue(theForm.CardNumber, 16, 16, "account number")==false) return false;

	if (validateNumeric(theForm.CardNumber, true, 14, 16, "account number")==false) return false;
}

function validateValue(theField, minLength, maxLength, fieldName) {

	var valid=false;
	var errorMsg="";

	if(theField.value == null)
		errorMsg = "Please enter "+fieldName+".";
	else if (theField.value.length==0)
		errorMsg = "Please enter "+fieldName+".";
	else if (theField.value.length<minLength || theField.value.length>maxLength)
		errorMsg = "Please enter "+fieldName+".";
	else
		valid = true;

	if (valid==false) {
		window.alert(errorMsg);
		try {theField.focus();} catch(e) {}
	}

	return valid;
}

function validateNumeric(theField, required, minLength, maxLength, fieldName) {

	var valid=false;
	var errorMsg="";

	if(theField.value==null && required==true)
		errorMsg = "Please enter 1 "+fieldName+".";
	else if (theField.value.length==0 && required==true)
		errorMsg = "Please enter 2 "+fieldName+".";
	else if (theField.value.length<minLength || theField.value.length>maxLength)
		errorMsg = "Please enter 3 "+fieldName+".";
	else
	{
		try {var value= new Number(theField.value);} catch(e) {return false;}
	}
	
	if (testValue==true && (value<minValue || value>maxValue))
		errorMsg = "Please enter "+fieldName+".";
	else
		valid = true;

	if (valid==false) {
		window.alert(errorMsg);
		try {theField.focus();} catch(e) {}
	}

	return valid;
}