// 18 Feb 97 created Eric Krock
// (c) 1997 Netscape Communications Corporation
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"
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 foo@bar.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 2 or 4 digit year number. 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 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;
 if (isEmpty(s)) return true;

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

 var c = s.charAt(i);

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

function stripCharsInBag (s, bag)

{ var i;
 var returnString = "";

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


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++)
 { 
 var c = s.charAt(i);

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

 return 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];

 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++)
 { 
 var c = s.charAt(i);

 if ((c == decimalPointDelimiter) && !seenDecimalPoint) seenDecimalPoint = true;
 else if (!isDigit(c)) return false;
 }

 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++)
 { 
 var c = s.charAt(i);

 if (!isLetter(c))
 return false;
 }
 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++)
 { 
 var c = s.charAt(i);

 if (! (isLetter(c) || isDigit(c) ) )
 return false;
 }
 return true;
}

function isEmail (s)
{ if (isEmpty(s)) 
 if (isEmail.arguments.length == 1) return defaultEmptyOK;
 else return (isEmail.arguments[1] == true);
 
 if (isWhitespace(s)) return false;
 
 var i = 1;
 var sLength = s.length;

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

 if ((i >= sLength) || (s.charAt(i) != "@")) return false;
 else i += 2;

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

 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 == 2) || (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)
{
 return ( ((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0) ) ) ? 29 : 28 );
}

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

 var intYear = parseInt(year);
 var intMonth = parseInt(month);
 var intDay = parseInt(day);

 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)
{
 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 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 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 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;
}

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;
}

function checkDate (yearField, monthField, dayField, labelString, OKtoOmitDay)
{
 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 getRadioButtonValue (radio)
{ for (var i = 0; i < radio.length; i++)
 { if (radio[i].checked) { break }
 }
 return radio[i].value
}