var digits = "0123456789";
var lowercaseLetters = "abcdefghijklmnopqrstuvwxyz"
var uppercaseLetters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
var whitespace = " \t\n\r";
var defaultEmptyOK = false
var decimalPointDelimiter = "."
var iEmail = "Please enter a valid email address (like your_name@company.com)"
var iUSPhone = "Please enter a 10 digit U.S. phone number (like 310 555 1212 or 310 555 1212 x 1234)"
var iZIPCode = "Please enter a 5 or 9 digit U.S. ZIP Code (like 92708)"
var digitsInUSPhoneNumber = 10;
var digitsInUSPhoneNumber2 = 12;
var digitsInUSPhoneNumber3 = 13;
var digitsInUSPhoneNumber4 = 14;
var ZIPCodeDelimiters = "-";
var ZIPCodeDelimeter = "-"
var validZIPCodeChars = digits + ZIPCodeDelimiters
var digitsInZIPCode1 = 5
var digitsInZIPCode2 = 9
var decimalPointDelimiter = "."
var phoneNumberDelimiters = "()-xX ";
var validUSPhoneChars = digits + phoneNumberDelimiters;

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

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

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

function warnMsg (theField, s)
{   theField.focus()
    alert(s)
    return false
}
// =============================

function alltrim(inputString) {
   if (typeof inputString != "string") { return inputString; }
   var retValue = inputString;
   var ch = retValue.substring(0, 1);
   while (ch == " ") { // Check for spaces at the beginning of the string
      retValue = retValue.substring(1, retValue.length);
      ch = retValue.substring(0, 1);
   }
   ch = retValue.substring(retValue.length-1, retValue.length);
   while (ch == " ") { // Check for spaces at the end of the string
      retValue = retValue.substring(0, retValue.length-1);
      ch = retValue.substring(retValue.length-1, retValue.length);
   }
   while (retValue.indexOf("  ") != -1) { // Note that there are two spaces in the string - look for multiple spaces within the string
      retValue = retValue.substring(0, retValue.indexOf("  ")) + retValue.substring(retValue.indexOf("  ")+1, retValue.length); // Again, there are two spaces in each of the strings
   }
   return retValue; 
} 

function checkEmptyString (theField, s)
{  
 if (isWhitespace(theField.value)) 
       return warnInvalid (theField, s);
    else return true;
}

function checkInteger (theField, s)
{   
    if (!isInteger(theField.value)) 
       return warnInvalid (theField, s);
    else return true;
}

function checkFloat(theField, s)
{   
    if (!isFloat(theField.value)) 
       return warnInvalid (theField, s);
    else return true;
}


function getListBoxIndex(lstbox)
{  
  var j=-1
   for (var i = 0; i < lstbox.length; i++)    { 
     if (lstbox.options[i].selected == true ) {
        j=i; break
        }
     }
  return j
}

function getListBoxValue(lstbox)
{  
  var s=""
   for (var i = 0; i < lstbox.length; i++)    { 
     if (lstbox.options[i].selected == true ) {
        s= lstbox.options[i].value; break
        }
     }
  return s
}

function isListBoxSelected(lstbox)
{  
  var j=-1
   for (var i = 0; i < lstbox.length; i++)    { 
     if (lstbox.options[i].selected == true ) {
        j=i
        return true
        }
     }
  return false
}

function checkListBoxSelected(lstbox,s)
{  
    if (isListBoxSelected(lstbox) == false) 
       return warnMsg (lstbox, s);
    else return true;
}

function checkEmptyListBox(lstbox,s)
{  
    if (getListBoxValue(lstbox) == "") 
       return warnMsg (lstbox, s);
    else return true;
}

function SelectListBoxItem(lstbox,s)
{  
   for (var i = 0; i < lstbox.length; i++)    { 
	    if (alltrim(lstbox.options[i].value) == s ) {
         lstbox.options[i].selected = true ; break
        }
     }
  return i
}

function SelectListBoxItemByText(lstbox,s)
{  
   for (var i = 0; i < lstbox.length; i++)    { 
	    if (alltrim(lstbox.options[i].text) == s ) {
         lstbox.options[i].selected = true ; break
        }
     }
  return i
}

function checkZero(theField, s)
{   
    if (theField.value == 0) 
       return warnInvalid (theField, s);
    else return true;
}

function checkMaxiValue(theField, iValue, s)
{   
    if (theField.value > iValue ) 
       return warnInvalid (theField, s);
    else return true;
}

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

function isRadioButtonSelected(RadioBtn)
{  
  var j=-1
   for (var i = 0; i < RadioBtn.length; i++)    { 
     if (RadioBtn[i].checked == true ) {
        j=i
        return true
        }
     }
  return false
}

function checkAnyRadioButtonSelected(RadioBtn,s)
{  
    if (isRadioButtonSelected(RadioBtn) == false) {
       RadioBtn[0].focus();
       alert(s);
       return false;
	   }
    else return true;
}

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;
}

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 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 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 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 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 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.length == digitsInUSPhoneNumber2) ||
							 (s.length == digitsInUSPhoneNumber3) ||
							 (s.length == digitsInUSPhoneNumber4) ))
}

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;
       }
    }
}