function validate_field(field,fieldName)
{
  // trim leading and trailing spaces
  field = trim(field);

  if (field==null||field=="")
  {
    alert(fieldName + ": Must be filled in");
    return false;
  }
}

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

function ltrim(stringToTrim)
{
  return stringToTrim.replace(/^\s+/,"");
}

function rtrim(stringToTrim)
{
  return stringToTrim.replace(/\s+$/,"");
}

function emailCheck(emailStr,fieldName)
{

  /* The following variable tells the rest of the function whether or not
  to verify that the address ends in a two-letter country or well-known
  TLD.  1 means check it, 0 means don't. */

  var checkTLD=1;

  /* The following is the list of known TLDs that an e-mail address must end with. */

  var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$/;

  /* The following pattern is used to check if the entered e-mail address
  fits the user@domain format.  It also is used to separate the username
  from the domain. */

  var emailPat=/^(.+)@(.+)$/;

  /* The following string represents the pattern for matching all special
  characters.  We don't want to allow special characters in the address.
  These characters include ( ) < > @ , ; : \ " . [ ] */

  var specialChars="\\(\\)><@,;:\\\\\\\"\\.\\[\\]";

  /* The following string represents the range of characters allowed in a
  username or domainname.  It really states which chars aren't allowed.*/

  var validChars="\[^\\s" + specialChars + "\]";

  /* The following pattern applies if the "user" is a quoted string (in
  which case, there are no rules about which characters are allowed
  and which aren't; anything goes).  E.g. "jiminy cricket"@disney.com
  is a legal e-mail address. */

  var quotedUser="(\"[^\"]*\")";

  /* The following pattern applies for domains that are IP addresses,
  rather than symbolic names.  E.g. joe@[123.124.233.4] is a legal
  e-mail address. NOTE: The square brackets are required. */

  var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;

  /* The following string represents an atom (basically a series of non-special characters.) */

  var atom=validChars + '+';

  /* The following string represents one word in the typical username.
  For example, in john.doe@somewhere.com, john and doe are words.
  Basically, a word is either an atom or quoted string. */

  var word="(" + atom + "|" + quotedUser + ")";

  // The following pattern describes the structure of the user

  var userPat=new RegExp("^" + word + "(\\." + word + ")*$");

  /* The following pattern describes the structure of a normal symbolic
  domain, as opposed to ipDomainPat, shown above. */

  var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$");

  /* Finally, let's start trying to figure out if the supplied address is valid. */

  /* Begin with the coarse pattern to simply break up user@domain into
  different pieces that are easy to analyze. */

  var matchArray=emailStr.match(emailPat);

  if (matchArray==null) {

  /* Too many/few @'s or something; basically, this address doesn't
  even fit the general mould of a valid e-mail address. */

  alert(fieldName + ": Incorrect address (check @ and .'s)");
  return false;
  }

  var user=matchArray[1];
  var domain=matchArray[2];

  // Start by checking that only basic ASCII characters are in the strings (0-127).

  for (i=0; i<user.length; i++) {
  if (user.charCodeAt(i)>127) {
  alert(fieldName + ": Ths username contains invalid characters.");
  return false;
     }
  }
  for (i=0; i<domain.length; i++) {
  if (domain.charCodeAt(i)>127) {
  alert(fieldName + ": Ths domain name contains invalid characters.");
  return false;
     }
  }

  // See if "user" is valid

  if (user.match(userPat)==null) {

  // user is not valid

  alert(fieldName + ": The username doesn't seem to be valid.");
  return false;
  }

  /* if the e-mail address is at an IP address (as opposed to a symbolic
  host name) make sure the IP address is valid. */

  var IPArray=domain.match(ipDomainPat);
  if (IPArray!=null) {

  // this is an IP address

  for (var i=1;i<=4;i++) {
  if (IPArray[i]>255) {
  alert(fieldName + ": Destination IP address is invalid!");
  return false;
     }
  }
  return true;
  }

  // Domain is symbolic name.  Check if it's valid.

  var atomPat=new RegExp("^" + atom + "$");
  var domArr=domain.split(".");
  var len=domArr.length;
  for (i=0;i<len;i++) {
  if (domArr[i].search(atomPat)==-1) {
  alert(fieldName + ": The domain name does not seem to be valid.");
  return false;
     }
  }

  /* domain name seems valid, but now make sure that it ends in a
  known top-level domain (like com, edu, gov) or a two-letter word,
  representing country (uk, nl), and that there's a hostname preceding
  the domain or country. */

  if (checkTLD && domArr[domArr.length-1].length!=2 &&
  domArr[domArr.length-1].search(knownDomsPat)==-1) {
  alert(fieldName + ": The address must end in a well-known domain or two letter " + "country.");
  return false;
  }

  // Make sure there's a host name preceding the domain.

  if (len<2) {
  alert(fieldName + ": This address is missing a hostname!");
  return false;
  }

  // If we've gotten this far, everything's valid!
  return true;
}

function chargeorinvoice(thisForm)
{
  // get the values from the form variables
  strName = thisForm.CUName.value;
  strEmail = thisForm.CUEmail.value;
  strPhone = thisForm.CUPhone.value;
  strSubject = thisForm.CUSubject.value;

  if (validate_field(strName,"Your Name")==false)
  {
    document.getElementById('CUName').focus();
    return false;
  }

  else if (emailCheck(strEmail, "Your email address")==false)
  {
    document.getElementById('CUEmail').focus();
    return false;
  }
  
  else if (validate_field(strPhone,"Your telephone number")==false)
  {
    document.getElementById('CUPhone').focus();
    return false;
  }

  else if (validate_field(strSubject,"Your Customer Number")==false)
  {
    document.getElementById('CUSubject').focus();
    return false;
  }

  else
  {

	if (document.paychoice.CUPaytype[0].checked==true)
	{
		document.paychoice.action="charge.asp";
	}
	
	else if (document.paychoice.CUPaytype[1].checked==true)
	{
		document.paychoice.action="invoice.asp";
	}
	
	else
	{
		alert("Please select a payment choice.");
		document.paychoice.CUPaytype[0].focus();
	    return false;
	}
	document.paychoice.submit();
	return true;
  }
}

function checkup(thisForm)
{
  // get the values from the form variables
  strName = thisForm.CUName.value;
  strEmail = thisForm.CUEmail.value;
  strPhone = thisForm.CUPhone.value;
  strCompany = thisForm.CUCompany.value;
  strSubject = thisForm.CUSubject.value;
  strAddress1 = thisForm.CUAddress1.value;
  strCity = thisForm.CUCity.value;
  strState = thisForm.CUState.value;
  strZIP = thisForm.CUZIP.value;
  strAltName = thisForm.CUAltName.value;
  strAltEmail = thisForm.CUAltEmail.value;
  strAltPhone = thisForm.CUAltPhone.value;
  
  if (validate_field(strName,"Your Name")==false)
  {
    document.getElementById('CUName').focus();
    return false;
  }
  else if (emailCheck(strEmail, "Your email address")==false)
  {
    document.getElementById('CUEmail').focus();
    return false;
  }
  else if (validate_field(strPhone,"Your Telephone Number")==false)
  {
    document.getElementById('CUPhone').focus();
    return false;
  }
  else if (validate_field(strCompany,"Your Company")==false)
  {
    document.getElementById('CUCompany').focus();
    return false;
  }
  else if (validate_field(strSubject,"The subject of your message")==false)
  {
    document.getElementById('CUSubject').focus();
    return false;
  }
  else if (validate_field(strAddress1,"Your Address")==false)
  {
    document.getElementById('CUAddress1').focus();
    return false;
  }
  else if (validate_field(strCity,"Your City")==false)
  {
    document.getElementById('CUCity').focus();
    return false;
  }
  else if (validate_field(strState,"Your State")==false)
  {
    document.getElementById('CUState').focus();
    return false;
  }
  else if (validate_field(strZIP,"Your ZIP Code")==false)
  {
    document.getElementById('CUZIP').focus();
    return false;
  }
  else if (validate_field(strAltName,"The Name of your Checkup Contact")==false)
  {
    document.getElementById('CUAltName').focus();
    return false;
  }
  else if (emailCheck(strAltEmail, "The email address of your Checkup Contact")==false)
  {
    document.getElementById('CUAltEmail').focus();
    return false;
  }
  else if (validate_field(strAltPhone,"The Telephone Number of your Checkup Contact")==false)
  {
    document.getElementById('CUAltPhone').focus();
    return false;
  }
  else
  {
    return true;
  }
}

function pwwwebinar(thisForm)
{
  // get the values from the form variables
  strName = thisForm.CUName.value;
  strEmail = thisForm.CUEmail.value;
  strPhone = thisForm.CUPhone.value;
  strCompany = thisForm.CUCompany.value;
  strAddress1 = thisForm.CUAddress1.value;
  strCity = thisForm.CUCity.value;
  strState = thisForm.CUState.value;
  strZIP = thisForm.CUZIP.value;
  strAltName = thisForm.CUAltName.value;
  strAltEmail = thisForm.CUAltEmail.value;
  strAltPhone = thisForm.CUAltPhone.value;
  
  if (validate_field(strName,"Attendee Name")==false)
  {
    document.getElementById('CUName').focus();
    return false;
  }
  else if (emailCheck(strEmail, "Attendee email address")==false)
  {
    document.getElementById('CUEmail').focus();
    return false;
  }
  else if (validate_field(strPhone,"Attendee Telephone Number")==false)
  {
    document.getElementById('CUPhone').focus();
    return false;
  }
  else if (validate_field(strAltName,"The Name of your Billing Contact (Accounts Payable)")==false)
  {
    document.getElementById('CUAltName').focus();
    return false;
  }
  else if (emailCheck(strAltEmail, "The email address of your Billing Contact (Accounts Payable)")==false)
  {
    document.getElementById('CUAltEmail').focus();
    return false;
  }
  else if (validate_field(strAltPhone,"The Telephone Number of your Billing Contact (Accounts Payable)")==false)
  {
    document.getElementById('CUAltPhone').focus();
    return false;
  }
  else if (validate_field(strCompany,"Your Service")==false)
  {
    document.getElementById('CUCompany').focus();
    return false;
  }
  else if (validate_field(strAddress1,"Your Billing Address")==false)
  {
    document.getElementById('CUAddress1').focus();
    return false;
  }
  else if (validate_field(strCity,"Your City")==false)
  {
    document.getElementById('CUCity').focus();
    return false;
  }
  else if (validate_field(strState,"Your State")==false)
  {
    document.getElementById('CUState').focus();
    return false;
  }
  else if (validate_field(strZIP,"Your Billing ZIP Code")==false)
  {
    document.getElementById('CUZIP').focus();
    return false;
  }
  else
  {

	if (document.invoiceform.PaymentType[0].checked==true)
	{
		document.invoiceform.action="paypal.asp";
	}
	
	else if (document.invoiceform.PaymentType[1].checked==true)
	{
		document.invoiceform.action="invoiceprocessing.asp";
	}
	
	else if (document.invoiceform.PaymentType[2].checked==true)
	{
		document.invoiceform.action="invoiceprocessing.asp";
	}
	
	else
	{
		alert("Please select a payment choice.");
		document.invoiceform.PaymentType[0].focus();
	    return false;
	}
	document.invoiceform.submit();
	return true;
  }
}

function usersgroup(thisForm)
{
  // get the values from the form variables
  strName = thisForm.CUName.value;
  strEmail = thisForm.CUEmail.value;
  strPhone = thisForm.CUPhone.value;
  strCompany = thisForm.CUCompany.value;
  strAddress1 = thisForm.CUAddress1.value;
  strCity = thisForm.CUCity.value;
  strState = thisForm.CUState.value;
  strZIP = thisForm.CUZIP.value;
  strAltName = thisForm.CUAltName.value;
  strAltEmail = thisForm.CUAltEmail.value;
  strAltPhone = thisForm.CUAltPhone.value;
  
  if (validate_field(strName,"Attendee Name")==false)
  {
    document.getElementById('CUName').focus();
    return false;
  }
  else if (emailCheck(strEmail, "Attendee email address")==false)
  {
    document.getElementById('CUEmail').focus();
    return false;
  }
  else if (validate_field(strPhone,"Attendee Telephone Number")==false)
  {
    document.getElementById('CUPhone').focus();
    return false;
  }
  else if (validate_field(strAltName,"The Name of your Billing Contact (Accounts Payable)")==false)
  {
    document.getElementById('CUAltName').focus();
    return false;
  }
  else if (emailCheck(strAltEmail, "The email address of your Billing Contact (Accounts Payable)")==false)
  {
    document.getElementById('CUAltEmail').focus();
    return false;
  }
  else if (validate_field(strAltPhone,"The Telephone Number of your Billing Contact (Accounts Payable)")==false)
  {
    document.getElementById('CUAltPhone').focus();
    return false;
  }
  else if (validate_field(strCompany,"Your Service")==false)
  {
    document.getElementById('CUCompany').focus();
    return false;
  }
  else if (validate_field(strAddress1,"Your Billing Address")==false)
  {
    document.getElementById('CUAddress1').focus();
    return false;
  }
  else if (validate_field(strCity,"Your City")==false)
  {
    document.getElementById('CUCity').focus();
    return false;
  }
  else if (validate_field(strState,"Your State")==false)
  {
    document.getElementById('CUState').focus();
    return false;
  }
  else if (validate_field(strZIP,"Your Billing ZIP Code")==false)
  {
    document.getElementById('CUZIP').focus();
    return false;
  }
  else
  {

	if (document.invoiceform.PaymentType[0].checked==true)
	{
		document.invoiceform.action="paypal.asp";
	}
	
	else if (document.invoiceform.PaymentType[1].checked==true)
	{
		document.invoiceform.action="invoiceprocessing.asp";
	}
	
	else if (document.invoiceform.PaymentType[2].checked==true)
	{
		document.invoiceform.action="invoiceprocessing.asp";
	}
	
	else
	{
		alert("Please select a payment choice.");
		document.invoiceform.PaymentType[0].focus();
	    return false;
	}
	document.invoiceform.submit();
	return true;
  }
}

function validateservices(thisForm)
{
  // get the values from the form variables
  strName = thisForm.CUName.value;
  strEmail = thisForm.CUEmail.value;
  strPhone = thisForm.CUPhone.value;
  strCompany = thisForm.CUCompany.value;
  strAddress1 = thisForm.CUAddress1.value;
  strCity = thisForm.CUCity.value;
  strState = thisForm.CUState.value;
  strZIP = thisForm.CUZIP.value;
  strAltName = thisForm.CUAltName.value;
  strAltEmail = thisForm.CUAltEmail.value;
  strAltPhone = thisForm.CUAltPhone.value;
  
  if (validate_field(strAltName,"The Name of your Contact")==false)
  {
    document.getElementById('CUAltName').focus();
    return false;
  }
  else if (emailCheck(strAltEmail, "The email address of your Contact")==false)
  {
    document.getElementById('CUAltEmail').focus();
    return false;
  }
  else if (validate_field(strAltPhone,"The Telephone Number of your Contact")==false)
  {
    document.getElementById('CUAltPhone').focus();
    return false;
  }
  else if (validate_field(strAltName,"The Name of your Billing Contact (Accounts Payable)")==false)
  {
    document.getElementById('CUName').focus();
    return false;
  }
  else if (emailCheck(strAltEmail, "The email address of your Billing Contact (Accounts Payable)")==false)
  {
    document.getElementById('CUEmail').focus();
    return false;
  }
  else if (validate_field(strAltPhone,"The Telephone Number of your Billing Contact (Accounts Payable)")==false)
  {
    document.getElementById('CUPhone').focus();
    return false;
  }
  else if (validate_field(strCompany,"Your Service")==false)
  {
    document.getElementById('CUCompany').focus();
    return false;
  }
  else if (validate_field(strAddress1,"Your Billing Address")==false)
  {
    document.getElementById('CUAddress1').focus();
    return false;
  }
  else if (validate_field(strCity,"Your City")==false)
  {
    document.getElementById('CUCity').focus();
    return false;
  }
  else if (validate_field(strState,"Your State")==false)
  {
    document.getElementById('CUState').focus();
    return false;
  }
  else if (validate_field(strZIP,"Your Billing ZIP Code")==false)
  {
    document.getElementById('CUZIP').focus();
    return false;
  }
  else
  {

	if (document.invoiceform.PaymentType[0].checked==true)
	{
		document.invoiceform.action="paypal.asp";
	}
	
	else if (document.invoiceform.PaymentType[1].checked==true)
	{
		document.invoiceform.action="invoiceprocessing.asp";
	}
	
	else if (document.invoiceform.PaymentType[2].checked==true)
	{
		document.invoiceform.action="invoiceprocessing.asp";
	}
	
	else
	{
		alert("Please select a payment choice.");
		document.invoiceform.PaymentType[0].focus();
	    return false;
	}
	document.invoiceform.submit();
	return true;
  }
}

function dupfields()
{
    document.getElementById('CUName').value = document.getElementById('CUAltName').value;
    document.getElementById('CUEmail').value = document.getElementById('CUAltEmail').value;
    document.getElementById('CUPhone').value = document.getElementById('CUAltPhone').value;
    document.getElementById('CUFax').focus();
	return true;
}