var defaultEmptyOK = false
var digitsInSocialSecurityNumber = 9;
var SSNDelimiters = "- ";
var iSSN = "This field must be a 9 digit U.S. social security number (like 123 45 6789). Please reenter it now."
var pSSN = "9 digit U.S. social security number (like 123 45 6789)."
var sSSN = "Social Security Number"
var reInteger = /^\d+$/


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


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

function isInteger (s)

{   var i;

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

    return reInteger.test(s)
}

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)
}




// 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) || isEmpty(theField.value)) {
          theField.focus();
          theField.select();
          return confirm('The SSN is not valid.\n\nIf you prefer us to call you for your SSN, click OK.\nOtherwise click Cancel to re-enter your SSN');
       }
       else 
       {  // if you don't want to reformats as 123-456-7890, comment next line out
          theField.value = reformatSSN(normalizedSSN)
          return true;
       }
//    }
}

function warnInvalid (theField, s)
{   theField.focus()
    theField.select()
    alert(s)
    return false
}