var nbsp = 160;		// non-breaking space char
var node_text = 3;	// DOM text node-type
var emptyString = /^\s*$/ ;
var global_valfield;	// retain valfield for timer thread

// --------------------------------------------
//                  trim
// Trim leading/trailing whitespace off string
// --------------------------------------------

function trim(str)
{
  return str.replace(/^\s+|\s+$/g, '');
}


// --------------------------------------------
//                  setfocus
// Delayed focus setting to get around IE bug
// --------------------------------------------

function setFocusDelayed()
{
  global_valfield.focus();
}

function setfocus(valfield)
{
  // save valfield in global variable so value retained when routine exits
  global_valfield = valfield;
  setTimeout( 'setFocusDelayed()', 100 );
}


// --------------------------------------------
//                  msg
// Display warn/error message in HTML element.
// commonCheck routine must have previously been called
// --------------------------------------------

function msg(fld,     // id of element to display message in
             msgtype, // class to give element ("warn" or "error")
             message) // string to display
{
  // setting an empty string can give problems if later set to a 
  // non-empty string, so ensure a space present. (For Mozilla and Opera one could 
  // simply use a space, but IE demands something more, like a non-breaking space.)
  var dispmessage;
  if (emptyString.test(message)) 
    dispmessage = String.fromCharCode(nbsp);    
  else  
    dispmessage = message;

  var elem = document.getElementById(fld);
  elem.firstChild.nodeValue = dispmessage;  
  
  elem.className = msgtype;   // set the CSS class to adjust appearance of message
}

// --------------------------------------------
//            commonCheck
// Common code for all validation routines to:
// (a) check for older / less-equipped browsers
// (b) check if empty fields are required
// Returns true (validation passed), 
//         false (validation failed) or 
//         proceed (don't know yet)
// --------------------------------------------

var proceed = 2;  

function commonCheck    (valfield,   // element to be validated
                         infofield,  // id of element to receive info/error msg
                         required)   // true if required
{
  if (!document.getElementById) 
    return true;  // not available on this browser - leave validation to the server
  var elem = document.getElementById(infofield);
  if (!elem.firstChild) return true;  // not available on this browser 
  if (elem.firstChild.nodeType != node_text) return true;  // infofield is wrong type of node  

  if (emptyString.test(valfield.value)) {
    if (required) {
      msg (infofield, "error", "Field required");  
      setfocus(valfield);
      return false;
    }
    else {
      msg (infofield, "warn", "");   // OK
      return true;  
    }
  }
  return proceed;
}

// --------------------------------------------
//            validatePresent
// Validate if something has been entered
// Returns true if so 
// --------------------------------------------

function validatePresent(valfield,   // element to be validated
                         infofield ) // id of element to receive info/error msg
{

  var stat = commonCheck (valfield, infofield, true);
  if (stat != proceed) return stat;
  msg (infofield, "warn", "");  
  return true;
}

// --------------------------------------------
//               validateEmail
// Validate if e-mail address
// Returns true if so (and also if could not be executed because of old browser)
// --------------------------------------------

function validateEmail  (valfield,   // element to be validated
                         infofield,  // id of element to receive info/error msg
                         required)   // true if required
{
  var stat = commonCheck (valfield, infofield, required);
  if (stat != proceed) return stat;

  var tfld = trim(valfield.value);  // value of field with whitespace trimmed off
  var email = /^[^@]+@[^@.]+\.[^@]*\w\w$/  ;
  if (!email.test(tfld)) {
    msg (infofield, "error", "Please use valid format: abc@domain.com");
    setfocus(valfield);
    return false;
  }

  var email2 = /^[A-Za-z][\w.-]+@\w[\w.-]+\.[\w.-]*[A-Za-z][A-Za-z]$/  ;
  if (!email2.test(tfld)) 
    msg (infofield, "warn", "Unusual e-mail address - If correct, please proceed.");
  else
    msg (infofield, "warn", "");
  return true;
}

// --------------------------------------------
//               validateDate
// Validate if date
// Returns true if so (and also if could not be executed because of old browser)
// --------------------------------------------
function validateDate  (valfield,   // element to be validated
                         infofield,  // id of element to receive info/error msg
                         required)   // true if required
{
  var flag = true
  var stat = commonCheck (valfield, infofield, required);
  if (stat != proceed) return stat;

  var tfld = trim(valfield.value);  // value of field with whitespace trimmed off
  
  
  var date1 = /^\d{2}\/\d{2}\/\d{4}$/  ;
  var date2 = /\d{2}\/\d{2}\/\d{4}/;
  //var date3 = /^\d{2}\.\d{2}\.\d{4}$/  ;
  //var date4 = /^\d{2}\-\d{2}\-\d{4}$/  ;
    
 
  //if ((date1.test(tfld)) || (date3.test(tfld)) || (date4.test(tfld)))
  if (tfld!=""){
    if ( (date2.test(tfld)) == false)  
    {
      msg (infofield, "error", "Error :: Please use valid format: mm/dd/yyyy");
      setfocus(valfield);
      flag = false;
    }
    else
    {
      msg (infofield, "warn", "");
      flag = true;
    }
  }
  else
  {
      msg (infofield, "error", "Error :: Please use valid format: mm/dd/yyyy");
      setfocus(valfield);
      flag = false;
  }

  
    
  

  return flag;
}


// --------------------------------------------
//               validateDate
// Validate if date
// Returns true if so (and also if could not be executed because of old browser)
// --------------------------------------------
function validateSSN  (valfield,   // element to be validated
                         infofield,  // id of element to receive info/error msg
                         required)   // true if required
{
  var flag = true
  var stat = commonCheck (valfield, infofield, required);
  if (stat != proceed) return stat;

  var tfld = trim(valfield.value);  // value of field with whitespace trimmed off
  var ssn = /\d{3}\-\d{2}\-\d{3}/;
    
 
  //if ((date1.test(tfld)) || (date3.test(tfld)) || (date4.test(tfld)))
  if (tfld!=""){
    if ( (ssn.test(tfld)) == false)  
    {
      msg (infofield, "error", "Error :: Please use valid format: xxx-xx-xxx");
      setfocus(valfield);
      flag = false;
    }
    else
    {
      msg (infofield, "warn", "");
      flag = true;
    }
  }
  else
  {
      msg (infofield, "error", "Error :: Please use valid format: xxx-xx-xxx");
      setfocus(valfield);
      flag = false;
  }

  return flag;
}

// --------------------------------------------
//             validateAge
// Validate person's age
// Returns true if OK 
// --------------------------------------------

function validatetTelnr    (valfield,   // element to be validated
                         infofield,  // id of element to receive info/error msg
                         required)   // true if required
{
  var stat = commonCheck (valfield, infofield, required);
  if (stat != proceed) return stat;

  var tfld = trim(valfield.value);
  var telNum = /^[0-9]{3,3}$/ ;
  if (!telNum.test(tfld)) {
    msg (infofield, "error", "Numeric values only or Incorrect length");
    setfocus(valfield);
    return false;
  }
  
  var telNum2 = /^[0-9]{3,3}$/  ;
  if (!telNum2.test(tfld)) 
    msg (infofield, "warn", "Numeric values only or Incorrect length");
  else
    msg (infofield, "warn", "");
  
  return true;
}

function validatefTelnr    (valfield,   // element to be validated
                         infofield,  // id of element to receive info/error msg
                         required)   // true if required
{
  var stat = commonCheck (valfield, infofield, required);
  if (stat != proceed) return stat;

  var tfld = trim(valfield.value);
  var telNum = /^[0-9]{4,4}$/ ;
  if (!telNum.test(tfld)) {
    msg (infofield, "error", "Numeric values only or Incorrect length");
    setfocus(valfield);
    return false;
  }
  
  var telNum2 = /^[0-9]{4,4}$/  ;
  if (!telNum2.test(tfld)) 
    msg (infofield, "warn", "Numeric values only or Incorrect length");
  else
    msg (infofield, "warn", "");
  
  return true;
}


function validatexTelnr    (valfield,   // element to be validated
                         infofield,  // id of element to receive info/error msg
                         required)   // true if required
{
  var tfld = trim(valfield.value);
  var xtelNum = /^[0-9]{1,15}$/
  if (!xtelNum.test(tfld)) {
    msg (infofield, "error", "Numeric values only or Incorrect length");
    setfocus(valfield);
    return false;
  }
  
  var xtelNum2 = /^[0-9]{1,15}$/  ;
  if (!xtelNum2.test(tfld)) 
    msg (infofield, "warn", "Numeric values only");
  else
    msg (infofield, "warn", "");
  
  return true;
}
// ----------------------------------------------
//				checkForm
//		alertbox for empty boxes
// ----------------------------------------------