// ----------------------------------------------------------------------
	// Javascript form validation routines.
	// Author: Stephen Poley
	//
	// Simple routines to quickly pick up obvious typos.
	// All validation routines return true if executed by an older browser:
	// in this case validation must be left to the server.
	//
	// Update Jun 2005: discovered that reason IE wasn't setting focus was
	// due to an IE timing bug. Added 0.1 sec delay to fix.
	//
	// Update Oct 2005: minor tidy-up: unused parameter removed
	//
	// Update Jun 2006: minor improvements to variable names and layout
	// ----------------------------------------------------------------------

	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", "ERROR: 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,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", "ERROR: not a valid e-mail address");
	    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 - check if correct");
	  else
	    msg (infofield, "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  (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 telnr = /^\+?[0-9 ()-]+[0-9]$/  ;
	  if (!telnr.test(tfld)) {
	    msg (infofield, "error", "ERROR: not a valid telephone number. Characters permitted are digits, space ()- and leading +");
	    setfocus(valfield);
	    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 (infofield, "error", "ERROR: " + numdigits + " digits - too short");
	    setfocus(valfield);
	    return false;
	  }

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

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

	function validateAge    (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 ageRE = /^[0-9]{1,3}$/
	  if (!ageRE.test(tfld)) {
	    msg (infofield, "error", "ERROR: not a valid age");
	    setfocus(valfield);
	    return false;
	  }

	  if (tfld>=200) {
	    msg (infofield, "error", "ERROR: not a valid age");
	    setfocus(valfield);
	    return false;
	  }

	  if (tfld>110) msg (infofield, "warn", "Older than 110: check correct");
	  else {
	    if (tfld<7) msg (infofield, "warn", "Bit young for this, aren't you?");
	    else        msg (infofield, "warn", "");
	  }
	  return true;
	}
	
	
function msg(fld,msgtype,message)
{
 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;   
}

	
var proceed = 2;  


	
function commonCheck2   (vfld,ifld)
{
	if (!document.getElementById) 
    return true;
  	var elem = document.getElementById(ifld);
  	if (!elem.firstChild)
    	return true; 
  	if (elem.firstChild.nodeType != node_text)
    	return true  

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

	
function validateConfirm   (vfld,ifld)
{
	var stat = commonCheck2(vfld, ifld);
	if (stat != proceed) return stat;
	
	if (vfld.checked) return true;
	
	// if we get here then the validation has failed
	
	var errorMsg = 'Please read the above message and confirm you agree to it';
	
	msg (ifld, "error", errorMsg);
	return false;
}