defaultEmptyOK = false;
var phoneNumberDelimiters = "()- ";
var digits = "0123456789";
var validPhoneChars = digits + phoneNumberDelimiters;

var daysInMonth = new Array(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;

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 isOlderThan(d, m, y, lower, upper)
{
    var yearAge = age(d, m, y);

    if(lower != -1 && yearAge < lower)
		return false;

	if(upper != -1 && yearAge > upper)
		return false;

	return true;
}

function age(d, m, y)
{
    var now = new Date();

    var yearNow = now.getYear();
    var monthNow = now.getMonth();
    var dateNow = now.getDate();

	if(yearNow < 200)
		yearNow = yearNow + 1900;

    var yearDob = y;
    var monthDob = m;
    var dateDob = d;

    var yearAge = yearNow - yearDob;

    if (monthNow >= monthDob)
        var monthAge = monthNow - monthDob;
    else {
        yearAge--;
        var monthAge = 12 + monthNow -monthDob;
    }

    if (dateNow >= dateDob)
        var dateAge = dateNow - dateDob;
    else {
        monthAge--;
        var dateAge = 31 + dateNow - dateDob;

        if (monthAge < 0) {
            monthAge = 11;
            yearAge--; 
        }
    }
    return yearAge;
}

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

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

function isEmpty(s)
{   return ((s == null) || (s.length == 0)) }

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

function checkForm (formObj) 
{
// Verify that all fields have valid information in them
with (formObj) {
   for (i = 0;i < elements.length; i++)
   {	
      if (isEmpty(elements[i].value) && elements[i].name.charAt (0) == "x") 
      {
         alert("All fields marked with an asterisk must be " +
               "completed with valid information before submission!")
         elements[i].focus();
         return false;
      }
   }

   if (elements["captchacode"] != null && elements["CODE"] != null)
   {
     if (!(elements["CODE"].value == hex_sha1(elements["captchacode"].value.toUpperCase())))
     {
       alert("Entered code is incorrect");
       elements["captchacode"].focus();
       return false;
     }
   }

}
return true;
}

function checkIntValue(object, minimum, maximum, errormsg, unit, emptyOK) {

var value = object.value;

if (emptyOK && isEmpty(value)) return true;
if ((!emptyOK) && isEmpty(value)) return false;

if (!isInteger(value)) {
alert("Please enter a valid numerical value for this field.");
object.focus();
return false;
}

if ((value < minimum) && (minimum > 0))
{
	alert(errormsg + " must be at least " + unit + minimum + ".");
	object.focus();
	return false;
}

if ((value > maximum) && (maximum > 0))
{
	alert(errormsg + " must be " + unit + maximum + " or less.");
	object.focus();
	return false;
}

return true;

}

function eitherOr(object1, object2, info) {

if (isEmpty(object1.value) && isEmpty(object2.value)) return true;
if (isEmpty(object1.value) && !isEmpty(object2.value)) return true;
if (!isEmpty(object1.value) && isEmpty(object2.value)) return true;

alert("Please enter the " + info + ".");

return false;
}
function checkYear (theField, emptyOK)
{   if (checkYear.arguments.length == 1) emptyOK = defaultEmptyOK;
    if ((emptyOK == true) && (isEmpty(theField))) return true;
    if (!isYear(theField, false)) 
       return false;
    else return true;
}
function checkMonth (theField, emptyOK)
{   if (checkMonth.arguments.length == 1) emptyOK = defaultEmptyOK;
    if ((emptyOK == true) && (isEmpty(theField))) return true;
    if (!isMonth(theField, false)) 
       return false;
    else return true;
}
function checkDay (theField, emptyOK)
{   if (checkDay.arguments.length == 1) emptyOK = defaultEmptyOK;
    if ((emptyOK == true) && (isEmpty(theField))) return true;
    if (!isDay(theField, false)) 
       return false;
    else return true;
}
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)) return false;
    if (!isMonth(monthField)) return false;
    if ( (OKtoOmitDay == true) && isEmpty(dayField) ) return true;
    else if (!isDay(dayField)) 
       return false;
    if (isDate (yearField, monthField, dayField))
       return true;
    return false;
}
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)
{   // 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;

    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 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 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 isPhoneNumber (s)
{   
	s = stripCharsInBag(s, phoneNumberDelimiters);
	if (isEmpty(s)) 
       if (isPhoneNumber.arguments.length == 1) return defaultEmptyOK;
       else return (isPhoneNumber.arguments[1] == true);
    return (isInteger(s))
}

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 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;
}