// BASIC DATA VALIDATION FUNCTIONS:

//

// isWhitespace (s)                    Check whether string s is empty or whitespace.

// isLetter (c)                        Check whether character c is an English letter 

// isDigit (c)                         Check whether character c is a digit 

// isLetterOrDigit (c)                 Check whether character c is a letter or digit.

// isInteger (s [,eok])                True if all characters in string s are numbers.

// isSignedInteger (s [,eok])          True if all characters in string s are numbers; leading + or - allowed.

// isPositiveInteger (s [,eok])        True if string s is an integer > 0.

// isNonnegativeInteger (s [,eok])     True if string s is an integer >= 0.

// isNegativeInteger (s [,eok])        True if s is an integer < 0.

// isNonpositiveInteger (s [,eok])     True if s is an integer <= 0.

// isFloat (s [,eok])                  True if string s is an unsigned floating point (real) number. (Integers also OK.)

// isSignedFloat (s [,eok])            True if string s is a floating point number; leading + or - allowed. (Integers also OK.)

// isAlphabetic (s [,eok])             True if string s is English letters 

// isAlphanumeric (s [,eok])           True if string s is English letters and numbers only.

// 

// isSSN (s [,eok])                    True if string s is a valid U.S. Social Security Number.

// isUSPhoneNumber (s [,eok])          True if string s is a valid U.S. Phone Number. 

// isInternationalPhoneNumber (s [,eok]) True if string s is a valid international phone number.

// isZIPCode (s [,eok])                True if string s is a valid U.S. ZIP code.

// isStateCode (s [,eok])              True if string s is a valid U.S. Postal Code

// isEmail (s [,eok])                  True if string s is a valid email address.

// isYear (s [,eok])                   True if string s is a valid Year number.

// isIntegerInRange (s, a, b [,eok])   True if string s is an integer between a and b, inclusive.

// isMonth (s [,eok])                  True if string s is a valid month between 1 and 12.

// isDay (s [,eok])                    True if string s is a valid day between 1 and 31.

// daysInFebruary (year)               Returns number of days in February of that year.

// isDate (year, month, day)           True if string arguments form a valid date.





// FUNCTIONS TO REFORMAT DATA:

//

// stripCharsInBag (s, bag)            Removes all characters in string bag from string s.

// stripCharsNotInBag (s, bag)         Removes all characters NOT in string bag from string s.

// stripWhitespace (s)                 Removes all whitespace characters from s.

// stripInitialWhitespace (s)          Removes initial (leading) whitespace characters from s.

// reformat (TARGETSTRING, STRING,     Function for inserting formatting characters or

//   INTEGER, STRING, INTEGER ... )       delimiters into TARGETSTRING.                                       

// reformatZIPCode (ZIPString)         If 9 digits, inserts separator hyphen.

// reformatSSN (SSN)                   Reformats as 123-45-6789.

// reformatUSPhone (USPhone)           Reformats as (123) 456-789.





// FUNCTIONS TO PROMPT USER:

//

// prompt (s)                          Display prompt string s in status bar.

// promptEntry (s)                     Display data entry prompt string s in status bar.

// warnEmpty (theField, s)             Notify user that required field theField is empty.

// warnInvalid (theField, s)           Notify user that contents of field theField are invalid.





// FUNCTIONS TO INTERACTIVELY CHECK FIELD CONTENTS:

//

// checkString (theField, s [,eok])    Check that theField.value is not empty or all whitespace.

// checkStateCode (theField)           Check that theField.value is a valid U.S. state code.

// checkZIPCode (theField [,eok])      Check that theField.value is a valid ZIP code.

// checkUSPhone (theField [,eok])      Check that theField.value is a valid US Phone.

// checkInternationalPhone (theField [,eok])  Check that theField.value is a valid International Phone.

// checkEmail (theField [,eok])        Check that theField.value is a valid Email.

// checkSSN (theField [,eok])          Check that theField.value is a valid SSN.

// checkYear (theField [,eok])         Check that theField.value is a valid Year.

// checkMonth (theField [,eok])        Check that theField.value is a valid Month.

// checkDay (theField [,eok])          Check that theField.value is a valid Day.

// checkDate (yearField, monthField, dayField, labelString, OKtoOmitDay)

//                                     Check that field values form a valid date.

// getRadioButtonValue (radio)         Get checked value from radio button.

// checkCreditCard (radio, theField)   Validate credit card info.





// CREDIT CARD DATA VALIDATION FUNCTIONS

// 

// isCreditCard (st)              True if credit card number passes the Luhn Mod-10 test.

// isVisa (cc)                    True if string cc is a valid VISA number.

// isMasterCard (cc)              True if string cc is a valid MasterCard number.

// isAmericanExpress (cc)         True if string cc is a valid American Express number.

// isDinersClub (cc)              True if string cc is a valid Diner's Club number.

// isCarteBlanche (cc)            True if string cc is a valid Carte Blanche number.

// isDiscover (cc)                True if string cc is a valid Discover card number.

// isEnRoute (cc)                 True if string cc is a valid enRoute card number.

// isJCB (cc)                     True if string cc is a valid JCB card number.

// isAnyCard (cc)                 True if string cc is a valid card number for any of the accepted types.

// isCardMatch (Type, Number)     True if Number is valid for credic card of type Type.



// VARIABLE DECLARATIONS



datetoday = new Date();

var digits = "0123456789";

var lowercaseLetters = "abcdefghijklmnopqrstuvwxyz"

var uppercaseLetters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

var whitespace = " \t\n\r";

var decimalPointDelimiter = "."

var phoneNumberDelimiters = "()- ";

var validUSPhoneChars = digits + phoneNumberDelimiters;

var validWorldPhoneChars = digits + phoneNumberDelimiters + "+";

var SSNDelimiters = "- ";

var validSSNChars = digits + SSNDelimiters;

var digitsInSocialSecurityNumber = 9;

var digitsInUSPhoneNumber = 10;

var ZIPCodeDelimiters = "-";

var ZIPCodeDelimeter = "-"

var validZIPCodeChars = digits + ZIPCodeDelimiters

var digitsInZIPCode1 = 5

var digitsInZIPCode2 = 9

var creditCardDelimiters = " "



var mPrefix = "You did not enter a value into the "

var mSuffix = " field. This is a required field. Please enter it now."



var sUSLastName = "Last Name"

var sUSFirstName = "First Name"

var sWorldLastName = "Family Name"

var sWorldFirstName = "Given Name"

var sTitle = "Title"

var sCompanyName = "Company Name"

var sUSAddress = "Street Address"

var sWorldAddress = "Address"

var sCity = "City"

var sStateCode = "State Code"

var sWorldState = "State, Province, or Prefecture"

var sCountry = "Country"

var sZIPCode = "ZIP Code"

var sWorldPostalCode = "Postal Code"

var sPhone = "Phone Number"

var sFax = "Fax Number"

var sDateOfBirth = "Date of Birth"

var sExpirationDate = "Expiration Date"

var sEmail = "Email"

var sSSN = "Social Security Number"

var sCreditCardNumber = "Credit Card Number"

var sOtherInfo = "Other Information"



// i is an abbreviation for "invalid"



var iStateCode = "This field must be a valid two character U.S. state abbreviation (like CA for California). Please reenter it now."

var iZIPCode = "This field must be a 5 or 9 digit U.S. ZIP Code (like 94043). Please reenter it now."

var iUSPhone = "This field must be a 10 digit U.S. phone number (like 415 555 1212). Please reenter it now."

var iWorldPhone = "This field must be a valid international phone number. Please reenter it now."

var iSSN = "This field must be a 9 digit U.S. social security number (like 123 45 6789). Please reenter it now."

var iEmail = "This field must be a valid email address (like Someone@somewhere.com). Please reenter it now."

var iCreditCardPrefix = "This is not a valid "

var iCreditCardSuffix = " credit card number. (Click the link on this form to see a list of sample numbers.) Please reenter it now."

var iDay = "This field must be a day number between 1 and 31.  Please reenter it now."

var iMonth = "This field must be a month number between 1 and 12.  Please reenter it now."

var iYear = "This field must be a 4 digit year number.  Please reenter it now."

var iDatePrefix = "The Month and Year for "

var iDateSuffix = " do not form a valid date.  Please reenter them now."



// p is an abbreviation for "prompt"



var pEntryPrompt = "Please enter a "

var pStateCode = "2 character code (like CA)."

var pZIPCode = "5 or 9 digit U.S. ZIP Code (like 94043)."

var pUSPhone = "10 digit U.S. phone number (like 415 555 1212)."

var pWorldPhone = "international phone number."

var pSSN = "9 digit U.S. social security number (like 123 45 6789)."

var pEmail = "valid email address (like foo@bar.com)."

var pCreditCard = "valid credit card number."

var pDay = "day number between 1 and 31."

var pMonth = "month number between 1 and 12."

var pYear = "2 or 4 digit year number."



var defaultEmptyOK = false



function makeArray(n) {

   for (var i = 1; i <= n; i++) {

      this[i] = 0

   } 

   return this

}



var daysInMonth = makeArray(12);

daysInMonth[1] = 31;

daysInMonth[2] = 29;   // must programmatically check this

daysInMonth[3] = 31;

daysInMonth[4] = 30;

daysInMonth[5] = 31;

daysInMonth[6] = 30;

daysInMonth[7] = 31;

daysInMonth[8] = 31;

daysInMonth[9] = 30;

daysInMonth[10] = 31;

daysInMonth[11] = 30;

daysInMonth[12] = 31;



var USStateCodeDelimiter = "|";

var USStateCodes = "AL|AK|AS|AZ|AR|CA|CO|CT|DE|DC|FM|FL|GA|GU|HI|ID|IL|IN|IA|KS|KY|LA|ME|MH|MD|MA|MI|MN|MS|MO|MT|NE|NV|NH|NJ|NM|NY|NC|ND|MP|OH|OK|OR|PW|PA|PR|RI|SC|SD|TN|TX|UT|VT|VI|VA|WA|WV|WI|WY|AE|AA|AE|AE|AP"



function isEmpty(s)

{   return ((s == null) || (s.length == 0))

}



function isWhitespace (s)



{   var i;



    // Is s empty?

    if (isEmpty(s)) return true;



    for (i = 0; i < s.length; i++)

    {   

        // Check that current character isn't whitespace.

        var c = s.charAt(i);



        if (whitespace.indexOf(c) == -1) return false;

    }

    // All characters are whitespace.

    return true;

}



function stripCharsInBag (s, bag)



{   var i;

    var returnString = "";



    // Search through string's characters one by one.

    // If character is not in bag, append to returnString.



    for (i = 0; i < s.length; i++)

    {   

        // Check that current character isn't whitespace.

        var c = s.charAt(i);

        if (bag.indexOf(c) == -1) returnString += c;

    }



    return returnString;

}



function stripCharsNotInBag (s, bag)



{   var i;

    var returnString = "";



    for (i = 0; i < s.length; i++)

    {   

        // Check that current character isn't whitespace.

        var c = s.charAt(i);

        if (bag.indexOf(c) != -1) returnString += c;

    }



    return returnString;

}



function stripWhitespace (s)



{   return stripCharsInBag (s, whitespace)

}



function charInString (c, s)

{   for (i = 0; i < s.length; i++)

    {   if (s.charAt(i) == c) return true;

    }

    return false

}



function stripInitialWhitespace (s)



{   var i = 0;



    while ((i < s.length) && charInString (s.charAt(i), whitespace))

       i++;

    

    return s.substring (i, s.length);

}



function isLetter (c)

{   return ( ((c >= "a") && (c <= "z")) || ((c >= "A") && (c <= "Z")) )

}



function isDigit (c)

{   return ((c >= "0") && (c <= "9"))

}



function isLetterOrDigit (c)

{   return (isLetter(c) || isDigit(c))

}



// EXAMPLE FUNCTION CALL:     RESULT:

// isInteger ("5")            true 

// isInteger ("")             defaultEmptyOK

// isInteger ("-5")           false

// isInteger ("", true)       true

// isInteger ("", false)      false

// isInteger ("5", false)     true

function isInteger (s)



{   var i;



    if (isEmpty(s)) 

       if (isInteger.arguments.length == 1) return defaultEmptyOK;

       else return (isInteger.arguments[1] == true);



    for (i = 0; i < s.length; i++)

    {   

        // Check that current character is number.

        var c = s.charAt(i);



        if (!isDigit(c)) return false;

    }



    // All characters are numbers.

    return true;

}

// EXAMPLE FUNCTION CALL:          RESULT:

// isSignedInteger ("5")           true 

// isSignedInteger ("")            defaultEmptyOK

// isSignedInteger ("-5")          true

// isSignedInteger ("+5")          true

// isSignedInteger ("", false)     false

// isSignedInteger ("", true)      true

function isSignedInteger (s)



{   if (isEmpty(s)) 

       if (isSignedInteger.arguments.length == 1) return defaultEmptyOK;

       else return (isSignedInteger.arguments[1] == true);



    else {

        var startPos = 0;

        var secondArg = defaultEmptyOK;



        if (isSignedInteger.arguments.length > 1)

            secondArg = isSignedInteger.arguments[1];



        // skip leading + or -

        if ( (s.charAt(0) == "-") || (s.charAt(0) == "+") )

           startPos = 1;    

        return (isInteger(s.substring(startPos, s.length), secondArg))

    }

}



function isPositiveInteger (s)

{   var secondArg = defaultEmptyOK;



    if (isPositiveInteger.arguments.length > 1)

        secondArg = isPositiveInteger.arguments[1];



    return (isSignedInteger(s, secondArg)

         && ( (isEmpty(s) && secondArg)  || (parseInt (s) > 0) ) );

}



function isNonnegativeInteger (s)

{   var secondArg = defaultEmptyOK;



    if (isNonnegativeInteger.arguments.length > 1)

        secondArg = isNonnegativeInteger.arguments[1];



    return (isSignedInteger(s, secondArg)

         && ( (isEmpty(s) && secondArg)  || (parseInt (s) >= 0) ) );

}



function isNegativeInteger (s)

{   var secondArg = defaultEmptyOK;



    if (isNegativeInteger.arguments.length > 1)

        secondArg = isNegativeInteger.arguments[1];



    return (isSignedInteger(s, secondArg)

         && ( (isEmpty(s) && secondArg)  || (parseInt (s) < 0) ) );

}



function isNonpositiveInteger (s)

{   var secondArg = defaultEmptyOK;



    if (isNonpositiveInteger.arguments.length > 1)

        secondArg = isNonpositiveInteger.arguments[1];



    return (isSignedInteger(s, secondArg)

         && ( (isEmpty(s) && secondArg)  || (parseInt (s) <= 0) ) );

}



function isFloat (s)



{   var i;

    var seenDecimalPoint = false;



    if (isEmpty(s)) 

       if (isFloat.arguments.length == 1) return defaultEmptyOK;

       else return (isFloat.arguments[1] == true);



    if (s == decimalPointDelimiter) return false;



    for (i = 0; i < s.length; i++)

    {   

        // Check that current character is number.

        var c = s.charAt(i);



        if ((c == decimalPointDelimiter) && !seenDecimalPoint) seenDecimalPoint = true;

        else if (!isDigit(c)) return false;

    }



    // All characters are numbers.

    return true;

}

function isSignedFloat (s)



{   if (isEmpty(s)) 

       if (isSignedFloat.arguments.length == 1) return defaultEmptyOK;

       else return (isSignedFloat.arguments[1] == true);



    else {

        var startPos = 0;

        var secondArg = defaultEmptyOK;



        if (isSignedFloat.arguments.length > 1)

            secondArg = isSignedFloat.arguments[1];



        // skip leading + or -

        if ( (s.charAt(0) == "-") || (s.charAt(0) == "+") )

           startPos = 1;    

        return (isFloat(s.substring(startPos, s.length), secondArg))

    }

}



function isAlphabetic (s)



{   var i;



    if (isEmpty(s)) 

       if (isAlphabetic.arguments.length == 1) return defaultEmptyOK;

       else return (isAlphabetic.arguments[1] == true);



    for (i = 0; i < s.length; i++)

    {   

        // Check that current character is letter.

        var c = s.charAt(i);



        if (!isLetter(c))

        return false;

    }



    // All characters are letters.

    return true;

}



function isAlphanumeric (s)



{   var i;



    if (isEmpty(s)) 

       if (isAlphanumeric.arguments.length == 1) return defaultEmptyOK;

       else return (isAlphanumeric.arguments[1] == true);



    for (i = 0; i < s.length; i++)

    {   

        // Check that current character is number or letter.

        var c = s.charAt(i);



        if (! (isLetter(c) || isDigit(c) ) )

        return false;

    }



    // All characters are numbers or letters.

    return true;

}



function reformat (s)



{   var arg;

    var sPos = 0;

    var resultString = "";



    for (var i = 1; i < reformat.arguments.length; i++) {

       arg = reformat.arguments[i];

       if (i % 2 == 1) resultString += arg;

       else {

           resultString += s.substring(sPos, sPos + arg);

           sPos += arg;

       }

    }

    return resultString;

}



function isSSN (s)

{   if (isEmpty(s)) 

       if (isSSN.arguments.length == 1) return defaultEmptyOK;

       else return (isSSN.arguments[1] == true);

    return (isInteger(s) && s.length == digitsInSocialSecurityNumber)

}



function isUSPhoneNumber (s)

{   if (isEmpty(s)) 

       if (isUSPhoneNumber.arguments.length == 1) return defaultEmptyOK;

       else return (isUSPhoneNumber.arguments[1] == true);

    return (isInteger(s) && s.length == digitsInUSPhoneNumber)

}



function isInternationalPhoneNumber (s)

{   if (isEmpty(s)) 

       if (isInternationalPhoneNumber.arguments.length == 1) return defaultEmptyOK;

       else return (isInternationalPhoneNumber.arguments[1] == true);

    return (isPositiveInteger(s))

}



function isZIPCode (s)

{  if (isEmpty(s)) 

       if (isZIPCode.arguments.length == 1) return defaultEmptyOK;

       else return (isZIPCode.arguments[1] == true);

   return (isInteger(s) && 

            ((s.length == digitsInZIPCode1) ||

             (s.length == digitsInZIPCode2)))

}



function isStateCode(s)

{   if (isEmpty(s)) 

       if (isStateCode.arguments.length == 1) return defaultEmptyOK;

       else return (isStateCode.arguments[1] == true);

    return ( (USStateCodes.indexOf(s) != -1) &&

             (s.indexOf(USStateCodeDelimiter) == -1) )

}



function isEmail (s)

{   if (isEmpty(s)) 

       if (isEmail.arguments.length == 1) return defaultEmptyOK;

       else return (isEmail.arguments[1] == true);

   

    // is s whitespace?

    if (isWhitespace(s)) return false;

    

    var i = 1;

    var sLength = s.length;



    // look for @

    while ((i < sLength) && (s.charAt(i) != "@"))

    { i++

    }



    if ((i >= sLength) || (s.charAt(i) != "@")) return false;

    else i += 2;



    // look for .

    while ((i < sLength) && (s.charAt(i) != "."))

    { i++

    }



    // there must be at least one character after the .

    if ((i >= sLength - 1) || (s.charAt(i) != ".")) return false;

    else return true;

}



function isYear (s)

{   if (isEmpty(s)) 

       if (isYear.arguments.length == 1) return defaultEmptyOK;

       else return (isYear.arguments[1] == true);

    if (!isNonnegativeInteger(s)) return false;

    return (s.length == 4);

}



function isIntegerInRange (s, a, b)

{   if (isEmpty(s)) 

       if (isIntegerInRange.arguments.length == 1) return defaultEmptyOK;

       else return (isIntegerInRange.arguments[1] == true);



    if (!isInteger(s, false)) return false;



    var num = parseInt (s);

    return ((num >= a) && (num <= b));

}



function isMonth (s)

{   if (isEmpty(s)) 

       if (isMonth.arguments.length == 1) return defaultEmptyOK;

       else return (isMonth.arguments[1] == true);

    return isIntegerInRange (s, 1, 12);

}



function isDay (s)

{   if (isEmpty(s)) 

       if (isDay.arguments.length == 1) return defaultEmptyOK;

       else return (isDay.arguments[1] == true);   

    return isIntegerInRange (s, 1, 31);

}



function daysInFebruary (year)

{   // February has 29 days in any year evenly divisible by four,

    // EXCEPT for centurial years which are not also divisible by 400.

    return (  ((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0) ) ) ? 29 : 28 );

}



function isDate (year, month, day)

{   // catch invalid years (not 2- or 4-digit) and invalid months and days.

    if (! (isYear(year, false) && isMonth(month, false) && isDay(day, false))) return false;



    // Explicitly change type to integer to make code work in both

    // JavaScript 1.1 and JavaScript 1.2.

    var intYear = parseInt(year);

    var intMonth = parseInt(month);

    var intDay = parseInt(day);



    // catch invalid days, except for February

    if (intDay > daysInMonth[intMonth]) return false; 



    if ((intMonth == 2) && (intDay > daysInFebruary(intYear))) return false;



    return true;

}



function prompt (s)

{   window.status = s

}



function promptEntry (s)

{   window.status = pEntryPrompt + s

}



function warnEmpty (theField, s)

{   theField.focus()

    alert(mPrefix + s + mSuffix)

    return false

}



function warnInvalid (theField, s)

{   theField.focus()

    theField.select()

    alert(s)

    return false

}



function checkString (theField, s, emptyOK)

{   // Next line is needed on NN3 to avoid "undefined is not a number" error

    // in equality comparison below.

    if (checkString.arguments.length == 2) emptyOK = defaultEmptyOK;

    if ((emptyOK == true) && (isEmpty(theField.value))) return true;

    if (isWhitespace(theField.value)) 

       return warnEmpty (theField, s);

    else return true;

}



function checkStateCode (theField, emptyOK)

{   if (checkStateCode.arguments.length == 1) emptyOK = defaultEmptyOK;

    if ((emptyOK == true) && (isEmpty(theField.value))) return true;

    else

    {  theField.value = theField.value.toUpperCase();

       if (!isStateCode(theField.value, false)) 

          return warnInvalid (theField, iStateCode);

       else return true;

    }

}



function reformatZIPCode (ZIPString)

{   if (ZIPString.length == 5) return ZIPString;

    else return (reformat (ZIPString, "", 5, "-", 4));

}



function checkZIPCode (theField, emptyOK)

{   if (checkZIPCode.arguments.length == 1) emptyOK = defaultEmptyOK;

    if ((emptyOK == true) && (isEmpty(theField.value))) return true;

    else

    { var normalizedZIP = stripCharsInBag(theField.value, ZIPCodeDelimiters)

      if (!isZIPCode(normalizedZIP, false)) 

         return warnInvalid (theField, iZIPCode);

      else 

      {  // if you don't want to insert a hyphen, comment next line out

         theField.value = reformatZIPCode(normalizedZIP)

         return true;

      }

    }

}



function reformatUSPhone (USPhone)

{   return (reformat (USPhone, "(", 3, ") ", 3, "-", 4))

}



function checkUSPhone (theField, emptyOK)

{   if (checkUSPhone.arguments.length == 1) emptyOK = defaultEmptyOK;

    if ((emptyOK == true) && (isEmpty(theField.value))) return true;

    else

    {  var normalizedPhone = stripCharsInBag(theField.value, phoneNumberDelimiters)

       if (!isUSPhoneNumber(normalizedPhone, false)) 

          return warnInvalid (theField, iUSPhone);

       else 

       {  // if you don't want to reformat as (123) 456-789, comment next line out

          theField.value = reformatUSPhone(normalizedPhone)

          return true;

       }

    }

}



function checkInternationalPhone (theField, emptyOK)

{   if (checkInternationalPhone.arguments.length == 1) emptyOK = defaultEmptyOK;

    if ((emptyOK == true) && (isEmpty(theField.value))) return true;

    else

    {  if (!isInternationalPhoneNumber(theField.value, false)) 

          return warnInvalid (theField, iWorldPhone);

       else return true;

    }

}



function checkEmail (theField, emptyOK)

{   if (checkEmail.arguments.length == 1) emptyOK = defaultEmptyOK;

    if ((emptyOK == true) && (isEmpty(theField.value))) return true;

    else if (!isEmail(theField.value, false)) 

       return warnInvalid (theField, iEmail);

    else return true;

}



function reformatSSN (SSN)

{   return (reformat (SSN, "", 3, "-", 2, "-", 4))

}



function checkSSN (theField, emptyOK)

{   if (checkSSN.arguments.length == 1) emptyOK = defaultEmptyOK;

    if ((emptyOK == true) && (isEmpty(theField.value))) return true;

    else

    {  var normalizedSSN = stripCharsInBag(theField.value, SSNDelimiters)

       if (!isSSN(normalizedSSN, false)) 

          return warnInvalid (theField, iSSN);

       else 

       {  // if you don't want to reformats as 123-456-7890, comment next line out

          theField.value = reformatSSN(normalizedSSN)

          return true;

       }

    }

}



function checkYear (theField, emptyOK)

{   yeartoday = datetoday.getYear()

    yeartoday = yeartoday + 1900;

    if (checkYear.arguments.length == 1) emptyOK = defaultEmptyOK;

    if ((emptyOK == true) && (isEmpty(theField.value))) return true;

    if (!isYear(theField.value, false))

       return warnInvalid (theField, iYear);

	if (theField.value < yeartoday)

	   return warnInvalid (theField, "Year has expired.  Please re-enter.");

    else return true;

}



function checkMonth (theField, emptyOK)

{   monthtoday = datetoday.getMonth() + 1

    if (checkMonth.arguments.length == 1) emptyOK = defaultEmptyOK;

    if ((emptyOK == true) && (isEmpty(theField.value))) return true;

    if (!isMonth(theField.value, false))

       return warnInvalid (theField, iMonth);

    else return true;

}



function checkDay (theField, emptyOK)

{   daytoday = datetoday.getDay()

    if (checkDay.arguments.length == 1) emptyOK = defaultEmptyOK;

    if ((emptyOK == true) && (isEmpty(theField.value))) return true;

    if (!isDay(theField.value, false))

       return warnInvalid (theField, iDay);

    else return true;

}



function checkDate (yearField, monthField, dayField, labelString, OKtoOmitDay)

{   yeartoday = datetoday.getYear();

    yeartoday = yeartoday + 1900;

	monthtoday = datetoday.getMonth() + 1;

    // Next line is needed on NN3 to avoid "undefined is not a number" error

    // in equality comparison below.

    if (checkDate.arguments.length == 4) OKtoOmitDay = false;

    if (!isYear(yearField.value)) return warnInvalid (yearField, iYear);

    if (!isMonth(monthField.value)) return warnInvalid (monthField, iMonth);

//    if ( (OKtoOmitDay == true) && isEmpty(dayField.value) ) return true;

//    else if (!isDay(dayField.value)) 

//       return warnInvalid (dayField, iDay);

    if (isDate (yearField.value, monthField.value, 1))

	   if (yearField.value > yeartoday) return true;

	   else if (yearField.value == yeartoday)

            if (monthField.value >= monthtoday)

	           return true;

    alert (iDatePrefix + labelString + iDateSuffix)

    return false

}



function getRadioButtonValue (radio)

{   for (var i = 0; i < radio.length; i++)

    {   if (radio[i].checked) { break }

    }

    return radio[i].value

}



function checkCreditCard (radio, theField)

{   var cardType = getRadioButtonValue (radio)

    var normalizedCCN = stripCharsInBag(theField.value, creditCardDelimiters)

    if (!isCardMatch(cardType, normalizedCCN)) 

       return warnInvalid (theField, iCreditCardPrefix + cardType + iCreditCardSuffix);

    else 

    {  theField.value = normalizedCCN

       return true

    }

}



function isCreditCard(st) {

  // Encoding only works on cards with less than 19 digits

  if (st.length > 19)

    return (false);



  sum = 0; mul = 1; l = st.length;

  for (i = 0; i < l; i++) {

    digit = st.substring(l-i-1,l-i);

    tproduct = parseInt(digit ,10)*mul;

    if (tproduct >= 10)

      sum += (tproduct % 10) + 1;

    else

      sum += tproduct;

    if (mul == 1)

      mul++;

    else

      mul--;

  }

  if ((sum % 10) == 0)

    return (true);

  else

    return (false);



} // END FUNCTION isCreditCard()



function isVisa(cc)

{

  if (((cc.length == 16) || (cc.length == 13)) &&

      (cc.substring(0,1) == 4))

    return isCreditCard(cc);

  return false;

}  // END FUNCTION isVisa()



function isMasterCard(cc)

{

  firstdig = cc.substring(0,1);

  seconddig = cc.substring(1,2);

  if ((cc.length == 16) && (firstdig == 5) &&

      ((seconddig >= 1) && (seconddig <= 5)))

    return isCreditCard(cc);

  return false;



} // END FUNCTION isMasterCard()



function isAmericanExpress(cc)

{

  firstdig = cc.substring(0,1);

  seconddig = cc.substring(1,2);

  if ((cc.length == 15) && (firstdig == 3) &&

      ((seconddig == 4) || (seconddig == 7)))

    return isCreditCard(cc);

  return false;



} // END FUNCTION isAmericanExpress()



function isDinersClub(cc)

{

  firstdig = cc.substring(0,1);

  seconddig = cc.substring(1,2);

  if ((cc.length == 14) && (firstdig == 3) &&

      ((seconddig == 0) || (seconddig == 6) || (seconddig == 8)))

    return isCreditCard(cc);

  return false;

}



function isCarteBlanche(cc)

{

  return isDinersClub(cc);

}



function isDiscover(cc)

{

  first4digs = cc.substring(0,4);

  if ((cc.length == 16) && (first4digs == "6011"))

    return isCreditCard(cc);

  return false;



} // END FUNCTION isDiscover()



function isEnRoute(cc)

{

  first4digs = cc.substring(0,4);

  if ((cc.length == 15) &&

      ((first4digs == "2014") ||

       (first4digs == "2149")))

    return isCreditCard(cc);

  return false;

}



function isJCB(cc)

{

  first4digs = cc.substring(0,4);

  if ((cc.length == 16) &&

      ((first4digs == "3088") ||

       (first4digs == "3096") ||

       (first4digs == "3112") ||

       (first4digs == "3158") ||

       (first4digs == "3337") ||

       (first4digs == "3528")))

    return isCreditCard(cc);

  return false;



} // END FUNCTION isJCB()



function isAnyCard(cc)

{

  if (!isCreditCard(cc))

    return false;

  if (!isMasterCard(cc) && !isVisa(cc) && !isAmericanExpress(cc) && !isDinersClub(cc) &&

      !isDiscover(cc) && !isEnRoute(cc) && !isJCB(cc)) {

    return false;

  }

  return true;



} // END FUNCTION isAnyCard()



function isCardMatch (cardType, cardNumber)

{



	cardType = cardType.toUpperCase();

	var doesMatch = true;



	if ((cardType == "VISA") && (!isVisa(cardNumber)))

		doesMatch = false;

	if ((cardType == "MASTERCARD") && (!isMasterCard(cardNumber)))

		doesMatch = false;

	if ( ( (cardType == "AMERICANEXPRESS") || (cardType == "AMEX") )

                && (!isAmericanExpress(cardNumber))) doesMatch = false;

	if ((cardType == "DISCOVER") && (!isDiscover(cardNumber)))

		doesMatch = false;

	if ((cardType == "JCB") && (!isJCB(cardNumber)))

		doesMatch = false;

	if ((cardType == "DINERS") && (!isDinersClub(cardNumber)))

		doesMatch = false;

	if ((cardType == "CARTEBLANCHE") && (!isCarteBlanche(cardNumber)))

		doesMatch = false;

	if ((cardType == "ENROUTE") && (!isEnRoute(cardNumber)))

		doesMatch = false;

	return doesMatch;



}  // END FUNCTION CardMatch()



function checkHolderName (theField)

{

   if (isEmpty(theField.value))

      return warnInvalid (theField, "Account Holder's Name Required to Complete Transaction...Please Enter");

   return true;

}



function checkBankName (theField)

{

   if (isEmpty(theField.value))

      return warnInvalid (theField, "Bank Name on Check Required to Complete Transaction...Please Enter");

   return true;

}



function checkBankCity (theField)

{

   if (isEmpty(theField.value))

      return warnInvalid (theField, "Bank City Required to Complete Transaction...Please Enter");

   return true;

}



function checkBankState (theField)

{

   if (isEmpty(theField.value))

      return warnInvalid (theField, "Bank State on Check Required to Complete Transaction...Please Enter");

   return true;

}



function checkCheckNo (theField)

{   if (isEmpty(theField.value))

       return warnInvalid (theField, "Check Number Required...Please Enter");

	if (!isInteger(theField.value,false))

       return warnInvalid (theField, "Check Number needs to consist of numbers between 0-9");

    return true;

}



function checkBankNo (theField)

{   if (isEmpty(theField.value))

       return warnInvalid (theField, "Bank Number Required...Please Enter");

    if (!isInteger(theField.value,false))

       return warnInvalid (theField, "Bank Number needs to consist of numbers between 0-9");

    if (theField.length < 2)

       return warnInvalid (theField, "Bank Number needs to be 1 or 2 digits.");

    return true;

}



function checkAccountNo (theField)

{   if (!isInteger(theField.value,false))

       return warnInvalid (theField, "Account Number needs to consist of numbers between 0-9");

    return true;

}



function checkTransitNo (theField)

{   if (!isInteger(theField.value,false))

       return warnInvalid (theField, "Transit Number needs to consist of numbers between 0-9");

    if (theField.value.length == 9)

	   return true;

	  else

	    return warnInvalid (theField, "Transit Number needs to be 9 digits.");

    return true;

}



function checkDigSignature (theField)

{

   if (isEmpty(theField.value))

      return warnInvalid (theField, "Digital Signature Required to Complete Transaction...Please Enter");

   return true;

}



function checkIfEmpty (theField)

{

   if (isEmpty(theField.value))

      return warnInvalid (theField, "Required Field...Please Enter");

   return true;

}