function validateCreditCard() {
    var elem;
    var errs=0;
	
	if (!validatePresent(document.forms.creditcard.cardtype,  'typeErr'))    errs += 1;
	if (!validatePresent(document.forms.creditcard.cardCVV2,  'cvv2Err'))    errs += 1;
	if (!validatePresent(document.forms.creditcard.cardexpire,  'expErr'))    errs += 1;
	if (!validateCredit(document.forms.creditcard.cardnumber,  'numErr', true))    errs += 1;
	if (!validatePresent(document.forms.creditcard.cardname,  'nameErr'))    errs += 1;
	

    if (errs>1)  alert('There are fields which need correction before sending');
    if (errs==1) alert('There is a field which needs correction before sending');

    return (errs==0);
  };
  
function validateCustomer() {
    var elem;
    var errs=0;
	
	if (!validatePresent(document.forms.customer.emailaddress,  'emailErr'))    errs += 1;
	if (!validatePresent(document.forms.customer.zip,  'zipErr'))    errs += 1;
	if (!validatePresent(document.forms.customer.state,  'stateErr'))    errs += 1;
	if (!validatePresent(document.forms.customer.city,  'cityErr'))    errs += 1;
	if (!validatePresent(document.forms.customer.address1,  'addr1Err'))    errs += 1;
	//if (!validateName(document.forms.customer.customername,  'nameErr', true))    errs += 1;
	
	//if (!validatePresent(document.forms.customer.scustomername,  'snameErr'))    errs += 1;
	if (!validatePresent(document.forms.customer.saddress1,  'saddr1Err'))    errs += 1;
	if (!validatePresent(document.forms.customer.scity,  'scityErr'))    errs += 1;
	if (!validatePresent(document.forms.customer.szip,  'szipErr'))    errs += 1;
				

    if (errs>1)  alert('There are fields which need correction before sending');
    if (errs==1) alert('There is a field which needs correction before sending');

    return (errs==0);
  };
// ----------------------------------------------------------------------
// Javascript form validation routines.
// ----------------------------------------------------------------------

var nbsp = 160;    // non-breaking space char
var node_text = 3; // DOM text node-type
var emptyString = /^\s*$/
var glb_vfld;      // retain vfld 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()
{
  glb_vfld.focus()
}

function setfocus(vfld)
{
  // save vfld in global variable so value retained when routine exits
  glb_vfld = vfld;
  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;  
  
};

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

  if (emptyString.test(vfld.value)) {
    if (reqd) {
      msg (ifld, "error", "*");  
      setfocus(vfld);
      return false;
    }
    else {
      msg (ifld, "warn", "");   // OK
      return true;  
    }
  }
  return proceed;
}

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

function validatePresent(vfld,   // element to be validated
                         ifld )  // id of element to receive info/error msg
{
  var stat = commonCheck (vfld, ifld, true);
  if (stat != proceed) return stat;

  msg (ifld, "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  (vfld,   // element to be validated
                         ifld,   // id of element to receive info/error msg
                         reqd)   // true if required
{
  var stat = commonCheck (vfld, ifld, reqd);
  if (stat != proceed) return stat;

  var tfld = trim(vfld.value);  // value of field with whitespace trimmed off
  var email = /^[^@]+@[^@.]+\.[^@]*\w\w$/
  if (!email.test(tfld)) {
    msg (ifld, "error", "ERROR: not a valid e-mail address");
    setfocus(vfld);
    return false;
  }

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


// -----------------------------------------
//            validateTelnr
// Validate telephone number
// Returns true if so (and also if could not be executed because of old browser)
// Permits spaces, hyphens, brackets and leading +
// -----------------------------------------

function validateTelnr  (vfld,   // element to be validated
                         ifld,   // id of element to receive info/error msg
                         reqd)   // true if required
{
  var stat = commonCheck (vfld, ifld, reqd);
  if (stat != proceed) return stat;

  var tfld = trim(vfld.value);  // value of field with whitespace trimmed off
  var telnr = /^\+?[0-9 ()-]+[0-9]$/
  if (!telnr.test(tfld)) {
    msg (ifld, "error", "ERROR: not a valid telephone number. Characters permitted are digits, space ()- and leading +");
    setfocus(vfld);
    return false;
  }

  var numdigits = 0;
  for (var j=0; j<tfld.length; j++)
    if (tfld.charAt(j)>='0' && tfld.charAt(j)<='9') numdigits++;

  if (numdigits<6) {
    msg (ifld, "error", "ERROR: " + numdigits + " digits - too short");
    setfocus(vfld);
    return false;
  }

  if (numdigits>14)
    msg (ifld, "warn", numdigits + " digits - check if correct");
  else { 
    if (numdigits<10)
      msg (ifld, "warn", "Only " + numdigits + " digits - check if correct");
    else
      msg (ifld, "warn", "");
  }
  return true;
};

// -----------------------------------------
//             validateNumberic
// Returns true if OK 
// -----------------------------------------

function validateNumeric (vfld,   // element to be validated
                         ifld,   // id of element to receive info/error msg
                         reqd)   // true if required
{
  var stat = commonCheck (vfld, ifld, reqd);
  if (stat != proceed) return stat;

  var tfld = trim(vfld.value);
  var ageRE = /^[0-9]{1,3}$/
  if (!ageRE.test(tfld)) {
    msg (ifld, "error", "Must be numeric. ");
    setfocus(vfld);
    return false;
  }

   msg (ifld, "warn", "");  
  return true;};
  
  // -----------------------------------------
//             validateCurrency
// Returns true if OK 
// -----------------------------------------

function validateCurrency (vfld,   // element to be validated
                         ifld,   // id of element to receive info/error msg
                         reqd)   // true if required
{
  var stat = commonCheck (vfld, ifld, reqd);
  if (stat != proceed) return stat;

  var tfld = trim(vfld.value);
  var currencyRE = /^((\$\d*)|(\$\d*\.\d{2})|(\d*)|(\d*\.\d{2}))$/
  if (!currencyRE.test(tfld)) {
    msg (ifld, "error", "Must be in dollars. ");
    setfocus(vfld);
    return false;
  }

   msg (ifld, "warn", "");  
  return true;};
  
  
  function validateCredit (vfld,   // element to be validated
                         ifld,   // id of element to receive info/error msg
                         reqd)   // true if required
{
  var stat = commonCheck (vfld, ifld, reqd);
  if (stat != proceed) return stat;

  var tfld = trim(vfld.value);
  var credRE = /^((4\d{3})|(5[1-5]\d{2})|(6011))-?\d{4}-?\d{4}-?\d{4}|3[4,7]\d{13}$/
  if (!credRE.test(tfld)) {
    msg (ifld, "error", "*");
    setfocus(vfld);
    return false;
  }

   msg (ifld, "warn", "");  
  return true;};


function validateName(vfld,   // element to validated
				 							ifld,   // id of element to receive info/error msg
											reqd)   // true if required
{
  var stat = commonCheck (vfld, ifld, reqd);
	if (stat != proceed) return stat;
	
	var tfld = trim(vfld.value);
	var nameRE=/^\w+\s\w+\s*\w*\s*\w*$/
	if (!nameRE.test(tfld)) {
		 msg (ifld, "error", "*");
		 setfocus(vfld);
		 return false;
	}
	
	msg(ifld, "warn", "");
	return true;
};