/*
Copyright 2003, Active Media Architects - www.activema.com
Usage of these scripts is limited to their original intent as developed and deployed for myplayerstats.com by Active Media Architects, Inc. Copying, selling or distributing these scripts, in whole or in part, is strictly prohibited. Changing these scripts by anyone other than Active Media Architects, Inc. will void any and all warranties, guarantees, promises, etc., whether communicated in writing, in person, electronically, or by any other means, made by Active Media Architects, Inc.
*/


// VARIABLE DECLARATIONS
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 diffPrefix = "You cannot add this as a new record because the ";
var diffMiddle = " has not changed.  Please enter a new ";
var diffSuffix = " now.";

// s is an abbreviation for "string"
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";
var sURL = "Website URL";
var sUserID = "User ID";
var sPasswd = "Password";


// 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 re-enter it before you continue.";
var iUSPhone = "Please enter a valid, 10-digit phone number (like 415-555-1212). Please re-enter it before you continue.";
var iWorldPhone = "This field must be a valid international phone number. Please re-enter it before you continue.";
var iSSN = "This field must be a 9 digit U.S. social security number (like 123 45 6789). Please re-enter it before you continue.";
var iEmail = "This field must be a valid email address (like joe@example.com). Please re-enter it before you continue.";
var iCreditCardPrefix = "This is not a valid ";
var iCreditCardSuffix = " credit card number. 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 2 or 4 digit year number.  Please reenter it now.";
var iSqlDate = "This filed must be a valid date in the form YYYY-MM-DD.  Please reenter it now.";
var iExpDate = "This field must be a day number between 1 and 31 and the 2 digit year number separated by the '/' character.  Please reenter it now.";
var iDatePrefix = "The Day, Month, and Year for ";
var iDateSuffix = " do not form a valid date.  Please reenter them now.";
var iURL = "This field must be a properly formatted URL (like http://www.someplace.com/index.htm). Please reenter it now.";
var iUserID = "This field must be a valid User ID. Please reenter it now.";
var iNewUserID = "User ID";
var iNewEmail = "Email Address";
var iPasswd = "The password must be entered twice to assure accuracy. Please reenter the password in both fields now.";
var iSelectAny = " field requires a valid selection to be made. Please choose an option now.";
var iSelectParticular1 = " field requires that the value of ";
var iSelectParticular2 = " be selected. Please choose that option now.";
var iNewPass = "Password";
var iCompanyType = "Please choose a valid company type.";
var iOSPlatform = "Please choose a valid Operating System Platform.";
var iInternetBrowser = "Please choose a valid option for your internet browser.";
var iInternetSpeed = "Please choose a valid option for your internet connection speed.";


// 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 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";


// Global variable defaultEmptyOK defines default return value
// for many functions when they are passed the empty string.
// By default, they will return defaultEmptyOK.
//
// defaultEmptyOK is false, which means that by default,
// these functions will do "strict" validation.  Function
// isInteger, for example, will only return true if it is
// passed a string containing an integer; if it is passed
// the empty string, it will return false.
//
// You can change this default behavior globally (for all
// functions which use defaultEmptyOK) by changing the value
// of defaultEmptyOK.
//
// Most of these functions have an optional argument emptyOK
// which allows you to override the default behavior for
// the duration of a function call.
//
// This functionality is useful because it is possible to
// say "if the user puts anything in this field, it must
// be an integer (or a phone number, or a string, etc.),
// but it's OK to leave the field empty too."
// This is the case for fields which are optional but which
// must have a certain kind of content if filled in.

var defaultEmptyOK = true;

// Attempting to make this library run on Navigator 2.0,
// so I'm supplying this array creation routine as per
// JavaScript 1.0 documentation.  If you're using
// Navigator 3.0 or later, you don't need to do this;
// you can use the Array constructor instead.
function makeArray(n) {
//*** BUG: If I put this line in, I get two error messages:
//(1) Window.length can't be set by assignment
//(2) daysInMonth has no property indexed by 4
//If I leave it out, the code works fine.
//   this.length = 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;

// Check whether string s is empty.
function isEmpty(s){ return ((s == null) || (s.length == 0))}

// Returns true if string s is empty or
// whitespace characters only.
function isWhitespace (s) {
	var i;

    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;
}

// Removes all characters which appear in string bag from string s.
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;
}

// Removes all characters which do NOT appear in string bag
// from string s.
function stripCharsNotInBag (s, bag) {
	var i;
    var returnString = "";

    // Search through string's characters one by one.
    // If character is 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;
}


// Removes all whitespace characters from s.
// Global variable whitespace (see above)
// defines which characters are considered whitespace.
function stripWhitespace (s) { return stripCharsInBag (s, whitespace); }


// WORKAROUND FUNCTION FOR NAVIGATOR 2.0.2 COMPATIBILITY.
//
// The below function *should* be unnecessary.  In general,
// avoid using it.  Use the standard method indexOf instead.
//
// However, because of an apparent bug in indexOf on
// Navigator 2.0.2, the below loop does not work as the
// body of stripInitialWhitespace:
//
// while ((i < s.length) && (whitespace.indexOf(s.charAt(i)) != -1))
//   i++;
//
// ... so we provide this workaround function charInString
// instead.
//
// charInString (CHARACTER c, STRING s)
//
// Returns true if single character c (actually a string)
// is contained within string s.
function charInString (c, s) {
	for (i = 0; i < s.length; i++) {
		if (s.charAt(i) == c) { return true; }
    }
    return false;
}



// Removes initial (leading) whitespace characters from s.
// Global variable whitespace (see above)
// defines which characters are considered whitespace.
function stripInitialWhitespace (s) {
	var i = 0;
    while ((i < s.length) && charInString (s.charAt(i), whitespace)){
       i++;}
    return s.substring (i, s.length);
}


// Returns true if character c is an English letter
// (A .. Z, a..z).
//
// NOTE: Need i18n version to support European characters.
// This could be tricky due to different character
// sets and orderings for various languages and platforms.
function isLetter (c) { return ( ((c >= "a") && (c <= "z")) || ((c >= "A") && (c <= "Z")) ); }

// Returns true if character c is a digit
// (0 .. 9).
function isDigit (c) { return ((c == "0") || (c == "1") || (c == "2") || (c == "3") || (c == "4") || (c == "5") || (c == "6") || (c == "7") || (c == "8") || (c == "9")); }

// Returns true if character c is a letter or digit.
function isLetterOrDigit (c) { return (isLetter(c) || isDigit(c)); }

// isInteger (STRING s [, BOOLEAN emptyOK])
//
// Returns true if all characters in string s are numbers.
//
// Accepts non-signed integers only. Does not accept floating
// point, exponential notation, etc.
//
// We don't use parseInt because that would accept a string
// with trailing non-numeric characters.
//
function isInteger (s) { 
	var i;
    if (isEmpty(s)) {
       if (isInteger.arguments.length == 1) { return defaultEmptyOK; }
       else { return (isInteger.arguments[1] == true); } }

    // Search through string's characters one by one
    // until we find a non-numeric character.
    // When we do, return false; if we don't, return 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;
}


// isSignedInteger (STRING s [, BOOLEAN emptyOK])
//
// Returns true if all characters are numbers;
// first character is allowed to be + or - as well.
//
// Does not accept floating point, exponential notation, etc.
//
// We don't use parseInt because that would accept a string
// with trailing non-numeric characters.
//
//
// 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));
    }
}


// isPositiveInteger (STRING s [, BOOLEAN emptyOK])
//
// Returns true if string s is an integer > 0.
//
// For explanation of optional argument emptyOK,
// see comments of function isInteger.
function isPositiveInteger (s) {
	var secondArg = defaultEmptyOK;

    if (isPositiveInteger.arguments.length > 1){
        secondArg = isPositiveInteger.arguments[1];}

    // The next line is a bit byzantine.  What it means is:
    // a) s must be a signed integer, AND
    // b) one of the following must be true:
    //    i)  s is empty and we are supposed to return true for
    //        empty strings
    //    ii) this is a positive, not negative, number

    return (isSignedInteger(s, secondArg) && ( (isEmpty(s) && secondArg)  || (parseInt (s) > 0) ) );
}

// isNonnegativeInteger (STRING s [, BOOLEAN emptyOK])
//
// Returns true if string s is an integer >= 0.
//
// For explanation of optional argument emptyOK,
// see comments of function isInteger.
function isNonnegativeInteger (s) {
	var secondArg = defaultEmptyOK;

    if (isNonnegativeInteger.arguments.length > 1){
        secondArg = isNonnegativeInteger.arguments[1];}

    // The next line is a bit byzantine.  What it means is:
    // a) s must be a signed integer, AND
    // b) one of the following must be true:
    //    i)  s is empty and we are supposed to return true for
    //        empty strings
    //    ii) this is a number >= 0

    return (isSignedInteger(s, secondArg)&& ( (isEmpty(s) && secondArg)  || (parseInt (s) >= 0) ) );
}



// isNegativeInteger (STRING s [, BOOLEAN emptyOK])
//
// Returns true if string s is an integer < 0.
//
// For explanation of optional argument emptyOK,
// see comments of function isInteger.
function isNegativeInteger (s) {
	var secondArg = defaultEmptyOK;

    if (isNegativeInteger.arguments.length > 1){
        secondArg = isNegativeInteger.arguments[1];}

    // The next line is a bit byzantine.  What it means is:
    // a) s must be a signed integer, AND
    // b) one of the following must be true:
    //    i)  s is empty and we are supposed to return true for
    //        empty strings
    //    ii) this is a negative, not positive, number

    return (isSignedInteger(s, secondArg) && ( (isEmpty(s) && secondArg)  || (parseInt (s) < 0) ) );
}


// isNonpositiveInteger (STRING s [, BOOLEAN emptyOK])
//
// Returns true if string s is an integer <= 0.
//
// For explanation of optional argument emptyOK,
// see comments of function isInteger.
function isNonpositiveInteger (s) {
	var secondArg = defaultEmptyOK;

    if (isNonpositiveInteger.arguments.length > 1){
        secondArg = isNonpositiveInteger.arguments[1];}

    // The next line is a bit byzantine.  What it means is:
    // a) s must be a signed integer, AND
    // b) one of the following must be true:
    //    i)  s is empty and we are supposed to return true for
    //        empty strings
    //    ii) this is a number <= 0

    return (isSignedInteger(s, secondArg) && ( (isEmpty(s) && secondArg)  || (parseInt (s) <= 0) ) );
}


// isFloat (STRING s [, BOOLEAN emptyOK])
//
// True if string s is an unsigned floating point (real) number.
//
// Also returns true for unsigned integers. If you wish
// to distinguish between integers and floating point numbers,
// first call isInteger, then call isFloat.
//
// Does not accept exponential notation.
//
// For explanation of optional argument emptyOK,
// see comments of function isInteger.
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; }

    // Search through string's characters one by one
    // until we find a non-numeric character.
    // When we do, return false; if we don't, return true.

    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;
}


// isSignedFloat (STRING s [, BOOLEAN emptyOK])
//
// True if string s is a signed or unsigned floating point
// (real) number. First character is allowed to be + or -.
//
// Also returns true for unsigned integers. If you wish
// to distinguish between integers and floating point numbers,
// first call isSignedInteger, then call isSignedFloat.
//
// Does not accept exponential notation.
//
// For explanation of optional argument emptyOK,
// see comments of function isInteger.
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));
    }
}


// isAlphabetic (STRING s [, BOOLEAN emptyOK])
//
// Returns true if string s is English letters
// (A .. Z, a..z) only.
//
// For explanation of optional argument emptyOK,
// see comments of function isInteger.
//
// NOTE: Need i18n version to support European characters.
// This could be tricky due to different character
// sets and orderings for various languages and platforms.
function isAlphabetic (s) {
	var i;

    if (isEmpty(s)){
       if (isAlphabetic.arguments.length == 1) {return defaultEmptyOK;}
       else {return (isAlphabetic.arguments[1] == true);}}

    // Search through string's characters one by one
    // until we find a non-alphabetic character.
    // When we do, return false; if we don't, return 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;
}


// isAlphanumeric (STRING s [, BOOLEAN emptyOK])
//
// Returns true if string s is English letters
// (A .. Z, a..z) and numbers only.
//
// For explanation of optional argument emptyOK,
// see comments of function isInteger.
//
// NOTE: Need i18n version to support European characters.
// This could be tricky due to different character
// sets and orderings for various languages and platforms.
function isAlphanumeric (s) {
	var i;

    if (isEmpty(s)){
       if (isAlphanumeric.arguments.length == 1) {return defaultEmptyOK;}
       else {return (isAlphanumeric.arguments[1] == true);}}

    // Search through string's characters one by one
    // until we find a non-alphanumeric character.
    // When we do, return false; if we don't, return 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;
}


// reformat (TARGETSTRING, STRING, INTEGER, STRING, INTEGER ... )      
//
// Handy function for arbitrarily inserting formatting characters
// or delimiters of various kinds within TARGETSTRING.
//
// reformat takes one named argument, a string s, and any number
// of other arguments.  The other arguments must be integers or
// strings.  These other arguments specify how string s is to be
// reformatted and how and where other strings are to be inserted
// into it.
//
// reformat processes the other arguments in order one by one.
// * If the argument is an integer, reformat appends that number
//   of sequential characters from s to the resultString.
// * If the argument is a string, reformat appends the string
//   to the resultString.
//
// NOTE: The first argument after TARGETSTRING must be a string.
// (It can be empty.)  The second argument must be an integer.
// Thereafter, integers and strings must alternate.  This is to
// provide backward compatibility to Navigator 2.0.2 JavaScript
// by avoiding use of the typeof operator.
//
// It is the caller's responsibility to make sure that we do not
// try to copy more characters from s than s.length.
//
// EXAMPLES:
//
// * To reformat a 10-digit U.S. phone number from "1234567890"
//   to "(123) 456-7890" make this function call:
//   reformat("1234567890", "(", 3, ") ", 3, "-", 4)
//
// * To reformat a 9-digit U.S. Social Security number from
//   "123456789" to "123-45-6789" make this function call:
//   reformat("123456789", "", 3, "-", 2, "-", 4)
//
// HINT:
//
// If you have a string which is already delimited in one way
// (example: a phone number delimited with spaces as "123 456 7890")
// and you want to delimit it in another way using function reformat,
// call function stripCharsNotInBag to remove the unwanted
// characters, THEN call function reformat to delimit as desired.
//
// EXAMPLE:
//
// reformat (stripCharsNotInBag ("123 456 7890", digits),
//           "(", 3, ") ", 3, "-", 4)
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;
}


// isSSN (STRING s [, BOOLEAN emptyOK])
//
// isSSN returns true if string s is a valid U.S. Social
// Security Number.  Must be 9 digits.
//
// NOTE: Strip out any delimiters (spaces, hyphens, etc.)
// from string s before calling this function.
//
// For explanation of optional argument emptyOK,
// see comments of function isInteger.
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);
}


// isUSPhoneNumber (STRING s [, BOOLEAN emptyOK])
//
// isUSPhoneNumber returns true if string s is a valid U.S. Phone
// Number.  Must be 10 digits.
//
// NOTE: Strip out any delimiters (spaces, hyphens, parentheses, etc.)
// from string s before calling this function.
//
// For explanation of optional argument emptyOK,
// see comments of function isInteger.
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 && s.charAt(0) != '1' && s.charAt(0) != '0') || (s.length == digitsInUSPhoneNumber+1 && s.charAt(0) == '1')));
}


// isInternationalPhoneNumber (STRING s [, BOOLEAN emptyOK])
//
// isInternationalPhoneNumber returns true if string s is a valid
// international phone number.  Must be digits only; any length OK.
// May be prefixed by + character.
//
// NOTE: A phone number of all zeros would not be accepted.
// I don't think that is a valid phone number anyway.
//
// NOTE: Strip out any delimiters (spaces, hyphens, parentheses, etc.)
// from string s before calling this function.  You may leave in
// leading + character if you wish.
//
// For explanation of optional argument emptyOK,
// see comments of function isInteger.
function isInternationalPhoneNumber (s) {
	if (isEmpty(s)){
       if (isInternationalPhoneNumber.arguments.length == 1) {return defaultEmptyOK;}
       else {return (isInternationalPhoneNumber.arguments[1] == true);}}
    return (isPositiveInteger(s));
}


// isZIPCode (STRING s [, BOOLEAN emptyOK])
//
// isZIPCode returns true if string s is a valid
// U.S. ZIP code.  Must be 5 or 9 digits only.
//
// NOTE: Strip out any delimiters (spaces, hyphens, etc.)
// from string s before calling this function. 
//
// For explanation of optional argument emptyOK,
// see comments of function isInteger.
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)));
}


// isStateCode (STRING s [, BOOLEAN emptyOK])
//
// Return true if s is a valid U.S. Postal Code
// (abbreviation for state).
//
// For explanation of optional argument emptyOK,
// see comments of function isInteger.
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) );
}


// isEmail (STRING s [, BOOLEAN emptyOK])
//
// Email address must be of form a@b.c -- in other words:
// * there must be at least one character before the @
// * there must be at least one character before and after the .
// * the characters @ and . are both required
//
// For explanation of optional argument emptyOK,
// see comments of function isInteger.
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;}
   
    // there must be >= 1 character before @, so we
    // start looking at character position 1
    // (i.e. second character)
    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;}
}


// isYear (STRING s [, BOOLEAN emptyOK])
//
// isYear returns true if string s is a valid
// Year number.  Must be 2 or 4 digits only.
//
// For Year 2000 compliance, you are advised
// to use 4-digit year numbers everywhere.
//
// And yes, this function is not Year 10000 compliant, but
// because I am giving you 8003 years of advance notice,
// I don't feel very guilty about this ...
//
// For B.C. compliance, write your own function. ;->
//
// For explanation of optional argument emptyOK,
// see comments of function isInteger.
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 == 2) || (s.length == 4));
}

function isYear4 (s) {
	if (isEmpty(s)){
       if (isYear4.arguments.length == 1) {return defaultEmptyOK;}
       else {return (isYear4.arguments[1] == true);}}
    if (!isNonnegativeInteger(s)) {return false;}
    return (s.length == 4);
}

// isIntegerInRange (STRING s, INTEGER a, INTEGER b [, BOOLEAN emptyOK])
//
// isIntegerInRange returns true if string s is an integer
// within the range of integer arguments a and b, inclusive.
//
// For explanation of optional argument emptyOK,
// see comments of function isInteger.
function isIntegerInRange (s, a, b) {
	if (isEmpty(s)){
       if (isIntegerInRange.arguments.length == 1) {return defaultEmptyOK;}
       else {return (isIntegerInRange.arguments[1] == true);}}

    // Catch non-integer strings to avoid creating a NaN below,
    // which isn't available on JavaScript 1.0 for Windows.
    if (!isInteger(s, false)) {return false;}

    // Now, explicitly change the type to integer via parseInt
    // so that the comparison code below will work both on
    // JavaScript 1.2 (which typechecks in equality comparisons)
    // and JavaScript 1.1 and before (which doesn't).
    var num = parseInt (s);
    return ((num >= a) && (num <= b));
}


// isMonth (STRING s [, BOOLEAN emptyOK])
//
// isMonth returns true if string s is a valid
// month number between 1 and 12.
//
// For explanation of optional argument emptyOK,
// see comments of function isInteger.
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 isSqlMonth (s) {
	if (isEmpty(s)) {
       if (isSqlMonth.arguments.length == 1) {return defaultEmptyOK;}
       else {return (isSqlMonth.arguments[1] == true);}}
    return (s.length == 2 && isIntegerInRange(parseInt(s), 1, 12));
}


// isDay (STRING s [, BOOLEAN emptyOK])
//
// isDay returns true if string s is a valid
// day number between 1 and 31.
//
// For explanation of optional argument emptyOK,
// see comments of function isInteger.
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 isSqlDay (s) {
	if (isEmpty(s)) {
       if (isSqlDay.arguments.length == 1) {return defaultEmptyOK;}
       else {return (isSqlDay.arguments[1] == true);}}
    return (s.length == 2 && isIntegerInRange (parseInt(s), 1, 31));
}


// daysInFebruary (INTEGER year)
//
// Given integer argument year,
// returns number of days in February of that year.
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 );
}


// isDate (STRING year, STRING month, STRING day)
//
// isDate returns true if string arguments year, month, and day
// form a valid date.
//
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 isSqlDate (year, month, day) {
	// catch invalid years (not 2- or 4-digit) and invalid months and days.
    if (! (isYear4(year, false) && isSqlMonth(month, false) && isSqlDay(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;
}

/* FUNCTIONS TO NOTIFY USER OF INPUT REQUIREMENTS OR MISTAKES. */

// Display prompt string s in status bar.
function prompt (s) { window.status = s }

// Display data entry prompt string s in status bar.
function promptEntry (s) { window.status = pEntryPrompt + s }

// Notify user that required field theField is empty.
// String s describes expected contents of theField.value.
// Put focus in theField and return false.
function warnEmpty (theField, s) {
	theField.focus();
	theField.select();
    alert(mPrefix + s + mSuffix);
	theField.focus();
    return false;
}

// Notify user that contents of field theField are invalid.
// String s describes expected contents of theField.value.
// select theField, put focus in it, and return false.
function warnInvalid (theField, s) {
	alert(s);
	theField.focus();
	theField.blur();
	theField.select();
	return false;
}

function warnSelectInvalid (theField, s) {
	alert(s);
	theField.focus();
	return false;
}

/* FUNCTIONS TO INTERACTIVELY CHECK VARIOUS FIELDS. */

// checkString (TEXTFIELD theField, STRING s, [, BOOLEAN emptyOK==false])
//
// Check that string theField.value is not all whitespace.
//
// For explanation of optional argument emptyOK,
// see comments of function isInteger.
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;}
}


// checkSameStrings (TEXTFIELD theField1, TEXTFIELD theField2, STRING s, [, BOOLEAN emptyOK==false])
//
// Check that string theField1.value is equal to string theField2.value and return true
//
// For explanation of optional argument emptyOK,
// see comments of function isInteger.
function checkSameStrings (theField1, theField2, s, emptyOK) {
    if (checkSameStrings.arguments.length == 3) { emptyOK = defaultEmptyOK; }
    if ((emptyOK == true) && (isEmpty(theField1.value)) && (isEmpty(theField2.value))) { return true; }
    if (theField1.value != theField2.value) { return warnInvalid (theField1, s); }
	else if ((emptyOK != true) && (isEmpty(theField1.value) || isEmpty(theField2.value))) { return warnInvalid (theField1, s); }
    else { return true; }
}


// checkDiffStrings (TEXTFIELD theField1, TEXTFIELD theField2, STRING s, [, BOOLEAN emptyOK==false])
//
// Check that string theField1.value is NOT equal to string theField2.value and return true
//
// For explanation of optional argument emptyOK,
// see comments of function isInteger.
function checkDiffStrings (theField1, theField2, s, emptyOK) {
    if (checkDiffStrings.arguments.length == 3) { emptyOK = defaultEmptyOK;}
    if ((emptyOK == true) && (isEmpty(theField1.value) || isEmpty(theField2.value))) { return true; }
    if (theField1.value == theField2.value) { return warnInvalid (theField1, diffPrefix + s + diffMiddle + s + diffSuffix); }
    else { return true; }
}


// checkURL (TEXTFIELD theField, STRING s, [, BOOLEAN emptyOK==false]))
//
// Check that string theField.value is in proper url format
//
// For explanation of optional argument emptyOK,
// see comments of function isInteger.
function checkURL(theField, emptyOK) {
    if (checkURL.arguments.length == 1) { emptyOK = defaultEmptyOK; }
    if ((emptyOK == true) && (isEmpty(theField.value))) { return true; }
	var myRegExp=/(http:\/\/)/gi;
	var myArray = myRegExp.exec(theField.value);
//	if (!(myArray) || (myRegExp.lastIndex != 7)) { return warnInvalid (theField, iURL); }
	if (!(myArray) || (myRegExp.lastIndex != 7)) { theField.value = "http://" + theField.value; }
    else { return true; }
}



// checkSelect (SELECTFIELD theField, CHAR mode, STRING pattern, STRING s[, BOOLEAN emptyOK==false]))
//
// the char mode is one of (v,V,i,I) indicating whether you are checking
// by the VALUE or the INDEX of the SELECTFIELD
// lowercase letters (default) indicate search for a MATCH
// UPPERCASE letters indicate a search for NO MATCH
// the string pattern is the comparison pattern.
// the string s is the error message
// Some preset messages include: iSelectParticular2 iSelectParticular1 iSelectAny
// An alternative property accesing method is:
// theField.options[theField.options.selectedIndex].value
//
// For explanation of optional argument emptyOK,
// see comments of function isInteger.
function checkSelect (theField, mode, pattern, s, emptyOK) {
	if (checkSelect.arguments.length == 4) { emptyOK = defaultEmptyOK; }
    if ((emptyOK == true) && (isEmpty(theField.value))) { return true; }
	else if ((emptyOK == true) && (theField.selectedIndex == -1)) { return true; }
	else if (((mode == "i") && (theField.selectedIndex == pattern)) ||
		((mode == "I") && (theField.selectedIndex != pattern)) ||
		((mode == "v") && (theField.value == pattern)) ||
		((mode == "V") && (theField.value != pattern))) { return true; }
   else { return warnSelectInvalid (theField, s); }
}


// checkStateCode (TEXTFIELD theField [, BOOLEAN emptyOK==false])
//
// Check that string theField.value is a valid U.S. state code.
//
// For explanation of optional argument emptyOK,
// see comments of function isInteger.
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 warnSelectInvalid (theField, iStateCode); }
       else { return true; } }
}



// takes ZIPString, a string of 5 or 9 digits;
// if 9 digits, inserts separator hyphen
function reformatZIPCode (ZIPString) {
	if (ZIPString.length == 5) { return ZIPString; }
    else { return (reformat (ZIPString, "", 5, "-", 4)); }
}

// checkZIPCode (TEXTFIELD theField [, BOOLEAN emptyOK==false])
//
// Check that string theField.value is a valid ZIP code.
//
// For explanation of optional argument emptyOK,
// see comments of function isInteger.
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; }
    }
}



// takes USPhone, a string of 10 digits
// and reformats as (123) 456-789
//function reformatUSPhone (USPhone) { return (reformat (USPhone.substring(USPhone.length-10,USPhone.length), "(", 3, ") ", 3, "-", 4)); }
function reformatUSPhone (USPhone) { return (reformat (USPhone.substring(USPhone.length-10,USPhone.length), "", 3, "-", 3, "-", 4)); }


// checkUSPhone (TEXTFIELD theField [, BOOLEAN emptyOK==false])
//
// Check that string theField.value is a valid US Phone.
//
// For explanation of optional argument emptyOK,
// see comments of function isInteger.
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;
       }
    }
}


// checkInternationalPhone (TEXTFIELD theField [, BOOLEAN emptyOK==false])
//
// Check that string theField.value is a valid International Phone.
//
// For explanation of optional argument emptyOK,
// see comments of function isInteger.
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;}
    }
}

// checkEmail (TEXTFIELD theField [, BOOLEAN emptyOK==false])
//
// Check that string theField.value is a valid Email.
//
// For explanation of optional argument emptyOK,
// see comments of function isInteger.
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;}
}


// takes SSN, a string of 9 digits
// and reformats as 123-45-6789
function reformatSSN (SSN) { return (reformat (SSN, "", 3, "-", 2, "-", 4)); }

// Check that string theField.value is a valid SSN.
//
// For explanation of optional argument emptyOK,
// see comments of function isInteger.
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;
       }
    }
}


// Check that string theField.value is a valid Year.
//
// For explanation of optional argument emptyOK,
// see comments of function isInteger.
function checkYear (theField, emptyOK) {
	if (checkYear.arguments.length == 1) {emptyOK = defaultEmptyOK;}
    if ((emptyOK == true) && (isEmpty(theField.value))){ return true;}
    if (!isYear(theField.value, false)){
       return warnInvalid (theField, iYear);}
    else {return true;}
}

function checkYear4 (theField, emptyOK) {
	if (checkYear4.arguments.length == 1) {emptyOK = defaultEmptyOK;}
    if ((emptyOK == true) && (isEmpty(theField.value))){ return true;}
    if (!isYear4(theField.value, false)){
       return warnInvalid (theField, iYear);}
    else {return true;}
}

// Check that string theField.value is a valid Month.
//
// For explanation of optional argument emptyOK,
// see comments of function isInteger.
function checkMonth (theField, emptyOK) {
	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;}
}


// Check that string theField.value is a valid Day.
//
// For explanation of optional argument emptyOK,
// see comments of function isInteger.
function checkDay (theField, emptyOK) {
	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;}
}


// checkDate (yearField, monthField, dayField, STRING labelString [, OKtoOmitDay==false])
//
// Check that yearField.value, monthField.value, and dayField.value
// form a valid date.
//
// If they don't, labelString (the name of the date, like "Birth Date")
// is displayed to tell the user which date field is invalid.
//
// If it is OK for the day field to be empty, set optional argument
// OKtoOmitDay to true.  It defaults to false.
function checkDate (yearField, monthField, dayField, labelString, OKtoOmitDay) {
	// 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, dayField.value)){
       return true;}
    alert (iDatePrefix + labelString + iDateSuffix);
    return false;
}

function checkSqlDate (dateField, emptyOK) {
	return true;
    if (checkSqlDate.arguments.length == 1) {emptyOK = defaultEmptyOK;}
    if ((emptyOK == true) && (isEmpty(dateField))){ return true;}
	dateFields = dateField.value.split("-");
    if (!isYear4(dateFields[0])){ return warnInvalid (dateField, iSqlDate);}
    if (!isSqlMonth(dateFields[1])) {return warnInvalid (dateField, iSqlDate);}
	if (!isSqlDay(dateFields[2])){ return warnInvalid (dateField, iSqlDate);}
    if (isSqlDate (dateFields[0], dateFields[1], dateFields[2])){ return true;}
    alert (iSqlDate);
    return false;
}


// Get checked value from radio button.
function getRadioButtonValue (radio) {
	for (var i = 0; i < radio.length; i++) {   if (radio[i].checked) { break; } }
    return radio[i].value;
}



// Validate credit card info.
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;
    }
}


// Validate credit card info without
// indicating the card type
function checkAnyCard (theField) {
    var normalizedCCN = stripCharsInBag(theField.value, creditCardDelimiters);
    if (!isAnyCard(normalizedCCN)) {
       return warnInvalid (theField, iCreditCardPrefix + iCreditCardSuffix);}
    else {  theField.value = normalizedCCN;
       return true;
    }
}


/*  ================================================================
    FUNCTION:  isCreditCard(st)

    INPUT:     st - a string representing a credit card number

    RETURNS:  true, if the credit card number passes the Luhn Mod-10
    test.
      false, otherwise
    ================================================================ */

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--;}
  }
// Uncomment the following line to help create credit card numbers
// 1. Create a dummy number with a 0 as the last digit
// 2. Examine the sum written out
// 3. Replace the last digit with the difference between the sum and
//    the next multiple of 10.

//  document.writeln("<BR>Sum      = ",sum,"<BR>");
//  alert("Sum      = " + sum);

  if ((sum % 10) == 0){
    return (true);}
  else{
    return (false);}

} // END FUNCTION isCreditCard()



/*  ================================================================
    FUNCTION:  isVisa()

    INPUT:     cc - a string representing a credit card number

    RETURNS:  true, if the credit card number is a valid VISA number.
   
      false, otherwise

    Sample number: 4111 1111 1111 1111 (16 digits)
    ================================================================ */

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()

    INPUT:     cc - a string representing a credit card number

    RETURNS:  true, if the credit card number is a valid MasterCard
    number.
   
      false, otherwise

    Sample number: 5500 0000 0000 0004 (16 digits)
    ================================================================ */

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()

    INPUT:     cc - a string representing a credit card number

    RETURNS:  true, if the credit card number is a valid American
    Express number.
   
      false, otherwise

    Sample number: 340000000000009 (15 digits)
    ================================================================ */

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()

    INPUT:     cc - a string representing a credit card number

    RETURNS:  true, if the credit card number is a valid Diner's
    Club number.
   
      false, otherwise

    Sample number: 30000000000004 (14 digits)
    ================================================================ */

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()

    INPUT:     cc - a string representing a credit card number

    RETURNS:  true, if the credit card number is a valid Carte
    Blanche number.
   
      false, otherwise
    ================================================================ */

function isCarteBlanche(cc) {
  return isDinersClub(cc);
}




/*  ================================================================
    FUNCTION:  isDiscover()

    INPUT:     cc - a string representing a credit card number

    RETURNS:  true, if the credit card number is a valid Discover
    card number.
   
      false, otherwise

    Sample number: 6011000000000004 (16 digits)
    ================================================================ */

function isDiscover(cc) {
  first4digs = cc.substring(0,4);
  if ((cc.length == 16) && (first4digs == "6011")){
    return isCreditCard(cc);}
  return false;

} // END FUNCTION isDiscover()





/*  ================================================================
    FUNCTION:  isEnRoute()

    INPUT:     cc - a string representing a credit card number

    RETURNS:  true, if the credit card number is a valid enRoute
    card number.
   
      false, otherwise

    Sample number: 201400000000009 (15 digits)
    ================================================================ */

function isEnRoute(cc) {
  first4digs = cc.substring(0,4);

  if ((cc.length == 15) &&
      ((first4digs == "2014") ||
       (first4digs == "2149"))){
    return isCreditCard(cc);}
  return false;
}



/*  ================================================================
    FUNCTION:  isJCB()

    INPUT:     cc - a string representing a credit card number

    RETURNS:  true, if the credit card number is a valid JCB
    card number.
   
      false, otherwise
    ================================================================ */

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()

    INPUT:     cc - a string representing a credit card number

    RETURNS:  true, if the credit card number is any valid credit
    card number for any of the accepted card types.
   
      false, otherwise
    ================================================================ */

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()

    INPUT:    cardType - a string representing the credit card type
      cardNumber - a string representing a credit card number

    RETURNS:  true, if the credit card number is valid for the particular
      credit card type given in "cardType".
   
      false, otherwise
    ================================================================ */

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;

}

/* shipping selector */
function go() {
    document.forms[0].submit();
}