var green_img = new Image();
var singleMenuonImg = new Image();
var singleMenuoffImg = new Image();
var spacer_img = new Image();
var navi_image = new Image();
var navi_image2 = new Image();
var BorderSepImage = new Image();
var loginOpen  = false;

singleMenuonImg.src = "../images/menusingle_on.jpg";
singleMenuoffImg.src = "../images/menusingle_off.jpg";
green_img.src = "../images/menu_strip.gif";
spacer_img.src = "../images/spacer.gif";
navi_image.src = "../images/lnavi_sub_on.gif";
navi_image2.src = "../images/lnavi_on.gif";
BorderSepImage.src = "../images/border_sep.jpg";

//change the background image 
function changeBg(elm){
	elm.style.backgroundImage = "url(" + singleMenuonImg.src + ")";
}

//change the background image 
function changeBgBack(elm){
	elm.style.backgroundImage = "url(" + singleMenuoffImg.src + ")";
}

function fixLooks() {
	var fldEle = document.getElementsByTagName('input');
	if(fldEle){
		for(i=0;i<fldEle.length;i++){
			if(fldEle[i].type == "radio" || fldEle[i].type == "checkbox"){
				fldEle[i].style.border = '0px';
			}
		}
	}
}

//function to disable endable the login textboxes
function DisableEnableBox(hide_box, unhide_box) {
	document.getElementById(hide_box).style.visibility = 'hidden';
	document.getElementById(hide_box).style.display = 'none';
	document.getElementById(unhide_box).style.visibility = 'visible';
	document.getElementById(unhide_box).style.display = 'block';
	document.getElementById(unhide_box).focus();
}

//draw the spacer images for the articles page
function draw_articles_spacer(val_i) {
	for (var i=1; i<eval(val_i); i++) {
		document.getElementById('art' + i).src = spacer_img.src;
	}	
}

function showtextbox(objSelectBox, title_tag, sel_val) {
	if (objSelectBox.options[objSelectBox.selectedIndex].value == eval(sel_val)) {
		document.getElementById(title_tag).style.visibility = 'visible';
		document.getElementById(title_tag).style.display = 'block';
	}else{
		document.getElementById(title_tag).style.visibility = 'hidden';
		document.getElementById(title_tag).style.display = 'block';
	}
}

function showHideDiv(objBox, div_tag, sel_val) {
	if (objBox.value == eval(sel_val)) {
		document.getElementById(div_tag).style.visibility = 'visible';
		document.getElementById(div_tag).style.display = 'block';
	}else{
		document.getElementById(div_tag).style.visibility = 'hidden';
		document.getElementById(div_tag).style.display = 'none';
	}
}

// function for the hide unhide on login box
function showhide(flag, ele){
	if(flag==1){ //show

		document.getElementById(ele).style.visibility = 'visible';
		document.getElementById(ele).style.display = 'block';
	} else{ //hide

		document.getElementById(ele).style.visibility = 'hidden';
		document.getElementById(ele).style.display = 'none';

	}
}


function hiderow(rid){
	sid = "s" + rid;
	hid = "h" + rid;
	hideObj = document.getElementById(hid);
	showObj = document.getElementById(sid);
	if(hideObj){
		hideObj.style.visibility = "hidden";
		hideObj.style.display = "none";
		showObj.style.visibility = "visible";
		showObj.style.display = "block";
	}
	if(rid == "row1") {
		document.loginbox.username.focus();
	}
	if(rid == "row2") {
		document.loginbox.password.focus();
	}
}
singleMenuonImg = new Image();
singleMenuonImg.src = "../images/menusingle_on.jpg";

singleMenuoffImg = new Image();
singleMenuoffImg.src = "../images/menusingle_off.jpg";

function changeBg(elm){
	elm.style.backgroundImage = "url(" + singleMenuonImg.src + ")";
}
function changeBgBack(elm){
	elm.style.backgroundImage = "url(" + singleMenuoffImg.src + ")";
}

function showOpts(selId){
	selObj = document.getElementById(selId);
	selObj.style.visibility = "visible";
	selObj.style.display = "block";
}
function hideOpts(selId){
	selObj = document.getElementById(selId);
	selObj.style.visibility = "hidden";
	selObj.style.display = "none";
}


// Original JavaScript code by Duncan Crombie: dcrombie@chirp.com.au
// Please acknowledge use of this code by including this header.

// CONSTANTS
var separator = ",";  // use comma as 000's separator
var decpoint = ".";  // use period as decimal point
var percent = "%";
var currency = "$";  // use dollar sign for currency

function formatNumber(number, format, print) {  // use: formatNumber(number, "format")
	if (print) document.write("formatNumber(" + number + ", \"" + format + "\")<br>");

	if (number - 0 != number) return null;  // if number is NaN return null
	var useSeparator = format.indexOf(separator) != -1;  // use separators in number
	var usePercent = format.indexOf(percent) != -1;  // convert output to percentage
	var useCurrency = format.indexOf(currency) != -1;  // use currency format
	var isNegative = (number < 0);
	number = Math.abs (number);
	if (usePercent) number *= 100;
	format = strip(format, separator + percent + currency);  // remove key characters
	number = "" + number;  // convert number input to string

	 // split input value into LHS and RHS using decpoint as divider
	var dec = number.indexOf(decpoint) != -1;
	var nleftEnd = (dec) ? number.substring(0, number.indexOf(".")) : number;
	var nrightEnd = (dec) ? number.substring(number.indexOf(".") + 1) : "";

 	// split format string into LHS and RHS using decpoint as divider
	dec = format.indexOf(decpoint) != -1;
	var sleftEnd = (dec) ? format.substring(0, format.indexOf(".")) : format;
	var srightEnd = (dec) ? format.substring(format.indexOf(".") + 1) : "";

 	// adjust decimal places by cropping or adding zeros to LHS of number
	if (srightEnd.length < nrightEnd.length) {
  		var nextChar = nrightEnd.charAt(srightEnd.length) - 0;
  		nrightEnd = nrightEnd.substring(0, srightEnd.length);
  		if (nextChar >= 5) nrightEnd = "" + ((nrightEnd - 0) + 1);  // round up
		// patch provided by Patti Marcoux 1999/08/06
  		while (srightEnd.length > nrightEnd.length) {
    		nrightEnd = "0" + nrightEnd;
  		}

  		if (srightEnd.length < nrightEnd.length) {
    		nrightEnd = nrightEnd.substring(1);
    		nleftEnd = (nleftEnd - 0) + 1;
  		}
	} else {
  		for (var i=nrightEnd.length; srightEnd.length > nrightEnd.length; i++) {
    		if (srightEnd.charAt(i) == "0") nrightEnd += "0";  // append zero to RHS of number
    		else break;
  		}
	}

 // adjust leading zeros
	sleftEnd = strip(sleftEnd, "#");  // remove hashes from LHS of format
	while (sleftEnd.length > nleftEnd.length) {
  		nleftEnd = "0" + nleftEnd;  // prepend zero to LHS of number
	}

	if (useSeparator) nleftEnd = separate(nleftEnd, separator);  // add separator
	var output = nleftEnd + ((nrightEnd != "") ? "." + nrightEnd : "");  // combine parts
	output = ((useCurrency) ? currency : "") + output + ((usePercent) ? percent : "");
	if (isNegative) {
			// patch suggested by Tom Denn 25/4/2001
			output = (useCurrency) ? "(" + output + ")" : "-" + output;
	}
	return output;
}

function strip(input, chars) {  // strip all characters in 'chars' from input
	var output = "";  // initialise output string
	for (var i=0; i < input.length; i++)
	if (chars.indexOf(input.charAt(i)) == -1)
		output += input.charAt(i);
	return output;
}

function separate(input, separator) {  // format input using 'separator' to mark 000's input = "" + input;
	var output = "";  // initialise output string
	for (var i=0; i < input.length; i++) {
		if (i != 0 && (input.length - i) % 3 == 0) output += separator;
	  		output += input.charAt(i);
	}
	return output;
}

function number_format(p,d) 
{
  var r;
  if(p<0){p=-p;r=format_number2(p,d);r="-"+r;}
  else   {r=format_number2(p,d);}
  return r;
}
function format_number2(pnumber,decimals) 
{
  var strNumber = new String(pnumber);
  var arrParts = strNumber.split('.');
  var intWholePart = parseInt(arrParts[0],10);
  var strResult = '';
  if (isNaN(intWholePart))
    intWholePart = '0';
  if(arrParts.length > 1)
  {
    var decDecimalPart = new String(arrParts[1]);
    var i = 0;
    var intZeroCount = 0;
     while ( i < String(arrParts[1]).length )
     {
       if( parseInt(String(arrParts[1]).charAt(i),10) == 0 )
       {
         intZeroCount += 1;
         i += 1;
       }
       else
         break;
    }
    decDecimalPart = parseInt(decDecimalPart,10)/Math.pow(10,parseInt(decDecimalPart.length-decimals-1)); 
    Math.round(decDecimalPart); 
    decDecimalPart = parseInt(decDecimalPart)/10; 
    decDecimalPart = Math.round(decDecimalPart); 

    //If the number was rounded up from 9 to 10, and it was for 1 'decimal' 
    //then we need to add 1 to the 'intWholePart' and set the decDecimalPart to 0. 

    if(decDecimalPart==Math.pow(10, parseInt(decimals)))
    { 
      intWholePart+=1; 
      decDecimalPart="0"; 
    } 
    var stringOfZeros = new String('');
    i=0;
    if( decDecimalPart > 0 )
    {
      while( i < intZeroCount)
      {
        stringOfZeros += '0';
        i += 1;
      }
    }
    decDecimalPart = String(intWholePart) + "." + stringOfZeros + String(decDecimalPart); 
    var dot = decDecimalPart.indexOf('.');
    if(dot == -1)
    {
      decDecimalPart += '.'; 
      dot = decDecimalPart.indexOf('.'); 
    } 
    var l=parseInt(dot)+parseInt(decimals); 
    while(decDecimalPart.length <= l) 
    {
      decDecimalPart += '0'; 
    }
    strResult = decDecimalPart;
  }
  else
  {
    var dot; 
    var decDecimalPart = new String(intWholePart); 

    decDecimalPart += '.'; 
    dot = decDecimalPart.indexOf('.'); 
    var l=parseInt(dot)+parseInt(decimals); 
    while(decDecimalPart.length <= l) 
    {
      decDecimalPart += '0'; 
    }
    strResult = decDecimalPart;
  }
  return strResult;
}

function fn_show_textbox(selected_val) {
	if(selected_val != 3){ //other
		document.getElementById('other_data_tag').style.visibility = 'hidden';
		document.getElementById('other_data_tag').style.display = 'none';
	}else{
		document.getElementById('other_data_tag').style.visibility = 'visible';
		document.getElementById('other_data_tag').style.display = 'block';
	}
}

function showhideSubImg(objImg, imgShow) {
	if (imgShow==1) {
		document.getElementById(objImg).style.visibility = 'visible';
	}else{
		document.getElementById(objImg).style.visibility = 'hidden';
	}
}

//CODE TO SHOW THE POPUP WINDOW
function fn_OpenWin (val, act, popWidth, popHeight) {
	if (val>0) {
		window.open('/index/popup_info.php?action=' + act + '&id=' + val, '_blank', 'width=' + popWidth + ', height=' + popHeight + ', scrollbars=1');
	}
}

var phone_field_length=0;
function TabNext(obj,event,len,next_field) {
	if (event == "down") {
		phone_field_length=obj.value.length;
	}else if (event == "up") {
		if (obj.value.length != phone_field_length) {
			phone_field_length=obj.value.length;
			if (phone_field_length == len) {
				next_field.focus();
			}
		}
	}
}

function validate_checked(){
	frmObj = document.forms['formSelect'];
	for(i=0;i<frmObj.length;i++){
		frmElm = frmObj.elements[i];
		if(frmElm.type == 'checkbox' && frmElm.checked){
			return true;
		}		
	}
	alert('Atleast one buddi needs to be selected to proceed');
	return false;
}

function updateDemoMail(bid, xpar, typeB) {
	var objEmail = document.getElementById('demoEmail');
	var objEmlEnt = document.getElementById('emlEnt');
	
	if (objEmlEnt.value=='0') {
		if (objEmail.value.length==0) {
			alert("Enter a valid email address");
		}else if (validateEmailAddr(objEmail.value)==false) {
			alert("Enter a valid email address");	
		}else{
			var ajaxVar = new ajaxVars();
			ajaxVar.vars['func'] = "updateDemoEmailAddr";
			ajaxVar.vars['email'] = objEmail.value;
			ajaxVar.fnVars['bid'] = bid;
			ajaxVar.fnVars['xpar'] = xpar;
			ajaxVar.fnVars['typeB'] = typeB;
			ajaxVar.vars['action'] = 'runFunction';
			ajaxVar.gotoFunction = "redirectDemo";
			ajaxVar.AjaxPostSQL();
		}
	}else{
		var fnVars = new Array();
		fnVars['typeB'] = typeB;
		fnVars['bid'] = bid;
		fnVars['xpar'] = xpar;
		redirectDemo('', fnVars);
	}
}

function redirectDemo(dataArr, fnVars) {
	var objEmlEnt = document.getElementById('emlEnt');
	objEmlEnt.value = 1;
	switch (fnVars['typeB']) {
		case 1:
			document.location.href="/index/findDevice.php?bid=" + fnVars['bid'] + "&xpar=" + fnVars['xpar'];
		break;
		case 2:
			document.location.href="/index/track.php?bid=" + fnVars['bid'];
		break;
		case 3:
			document.location.href="/index/demoFence.php";
		break;
	}
}


//function to check the email
function validateEmailAddr(fieldValue){
	var chkAt = fieldValue.indexOf("@");
	var chkDot= fieldValue.indexOf(".");
	var chkHack= fieldValue.indexOf("@.");
	var chkHackA= fieldValue.indexOf(".@");

	if((chkAt >= 0) && (chkDot >= 0) && (chkHack == -1) && (chkHackA == -1) ) {
		return true;
	}
	return false;
}

function fill_econtacts(obj){
	if(obj.value == '--select buddi--'){
		var elmChk = document.getElementsByTagName("input");
		for(i=0;i<elmChk.length;i++){
			if(elmChk[i].type == 'checkbox'){
				elmChk[i].checked = false;
				elmChk[i].disabled = true;
			}
		}
		var tblObj = document.getElementById('xList');
		cleanWhitespace(tblObj);
		var tbody = tblObj.childNodes[0];
		var xJ = tbody.childNodes.length;
		for (var xI=0; xI<xJ; xI++) {
			var tmpX = tbody.childNodes[xI].id.split("_");
			document.getElementById('up_' + tmpX[1]).src = "/proimages/spacer.gif";
			document.getElementById('dwn_' + tmpX[1]).src = "/proimages/spacer.gif";
		}
		
	}else{
		document.select_buddi.submit();
	}
	
}

function save_econtact(obj){
	var split_id = obj.id.split('-');

	if(split_id[2]){
		showLoader();
		var ajaxVar = new ajaxVars();
		ajaxVar.vars['func'] = "updateWearerContact";
		ajaxVar.vars['contact_id'] = split_id[1];
		ajaxVar.vars['wId'] = split_id[2];
		if(obj.checked){
			ajaxVar.vars['act'] = "add";
			ajaxVar.fnVars['act'] = "add";
		}else{
			ajaxVar.vars['act'] = "del";
			ajaxVar.fnVars['act'] = "del";
		}
		ajaxVar.fnVars['chkBox'] = obj;
		ajaxVar.vars['action'] = 'runFunction';
		ajaxVar.gotoFunction = "saved_success";
		ajaxVar.AjaxPostSQL();
	}
}

function saved_success(dataArr,fnVars){
	hideLoader();
	if(fnVars['act'] == 'add'){
		var chkVal = 0;
		var elmChk = document.getElementsByTagName("input");
		for(i=0, j=0;i<elmChk.length;i++){
			if (elmChk[i].checked == true) {
				chkVal = j;
				j++;
			}
		}

		var curNode = fnVars['chkBox'].parentNode.parentNode;
		var tblObj = curNode.parentNode;
		cleanWhitespace(tblObj);
		tblObj.insertBefore(curNode, tblObj.childNodes[chkVal]);
		
		// since u got the tr then replace the up down arrows with spacer
		var tmpX = curNode.id.split("_");
		document.getElementById('up_' + tmpX[1]).src = "/proimages/gridUpBlue.jpg";
		document.getElementById('dwn_' + tmpX[1]).src = "/proimages/gridDownBlue.jpg";
		
		alert('This change has been saved and the emergency contact has been assigned');
	}else{
		var curNode = fnVars['chkBox'].parentNode.parentNode; // this is the tr
		var tblObj = curNode.parentNode;
		tblObj.appendChild(curNode);
		
		// since u got the tr then replace the up down arrows with spacer
		var tmpX = curNode.id.split("_");
		document.getElementById('up_' + tmpX[1]).src = "/proimages/spacer.gif";
		document.getElementById('dwn_' + tmpX[1]).src = "/proimages/spacer.gif";
		
		alert('This change has been saved and the emergency contact has been removed');
	}
}

function cleanWhitespace(node) {
	var notWhitespace = /\S/;
	for(var i=0;i<node.childNodes.length; i++) {
		var childNode = node.childNodes[i];
		if ((childNode.nodeType == 3)&&(!notWhitespace.test(childNode.nodeValue))) {
			node.removeChild(node.childNodes[i]);
			i--;
		}
		if(childNode.nodeType == 1) {
			cleanWhitespace(childNode);
		}
	}
}

function showLoader() {
	var loaderObj = document.getElementById('loadDiv1');
	loaderObj.style.visibility = 'visible';
	loaderObj.style.display = 'block';
}

function hideLoader() {
	var loaderObj = document.getElementById('loadDiv1');
	loaderObj.style.visibility = 'hidden';
	loaderObj.style.display = 'none';
}

function loadLoader() {
	var loaderObj = document.getElementById('loadDiv1');
	var xListObj = document.getElementById('xList');
	loaderObj.style.height = xListObj.offsetHeight + 'px';
	loaderObj.style.lineHeight = xListObj.offsetHeight + 'px';
	loaderObj.style.visibility = 'hidden';
	loaderObj.style.display = 'none';
}

function orderContact(obj, up) {
	if (obj.src.indexOf('spacer.gif')>=0) {
		// this cannot be moved
	}else{
		var tmpId = obj.id.split("_");
		
		// get how many are ticked
		var elmChk = document.getElementsByTagName("input");
		for(xI=0, xY=-1; xI<elmChk.length; xI++){
			if (elmChk[xI].checked == true) xY++;
		}
		
		//get which is the current row index
		var curNode = obj.parentNode.parentNode;
		var xZ = curNode.rowIndex;
		var tblObj = curNode.parentNode;
		cleanWhitespace(tblObj);
		
		if (up==1) {
			//check if the row index is less than those ticked then only can you move on top
			xZ--;
			if ((xZ <= xY) && (xZ>=0)) {
				tblObj.insertBefore(curNode, tblObj.childNodes[xZ]);
				saveAllContacts();
			}
		}else{
			//check if the row index is less than those ticked then only can you move on top
			xZ++;
			if ((xZ <= xY) && (xZ<=tblObj.childNodes.length)) {
				tblObj.insertBefore(tblObj.childNodes[xZ], curNode);
				saveAllContacts();
			}
		}
		
	}
}

function saveAllContacts(obj) {
	var chkVal = "";
	var elmChk = document.getElementsByTagName("input");
	var selObj = document.getElementById('buddi_id');
	var wearId = 0;
	for(i=0, j=0;i<elmChk.length;i++){
		if (elmChk[i].checked == true) {
			var tmpSlit = elmChk[i].id.split('-');
			chkVal = chkVal + tmpSlit[1] + ',';
			wearId = tmpSlit[2];
		}
	}
	
	if (chkVal.length>0 && wearId>0) {
		showLoader();
		var ajaxVar = new ajaxVars();
		ajaxVar.vars['func'] = "updateWearerContactsOrder";
		ajaxVar.vars['contact_id'] = chkVal;
		ajaxVar.vars['wId'] = wearId;
		ajaxVar.fnVars['chkBox'] = obj;
		ajaxVar.vars['action'] = 'runFunction';
		ajaxVar.gotoFunction = "hideLoader";
		ajaxVar.AjaxPostSQL();
	}

}

function chLoginBoxStyle(inputObj) {
	if (inputObj.value == 'email address') {
		inputObj.style.color = '#777';
		inputObj.value = '';
	}else if (inputObj.id.indexOf('Mock')>=0) {
		inputObj.value = '';
		var passId = inputObj.id.replace('Mock','');
		var passObj= inputObj.cloneNode(true);
		if (inputObj.onkeydown) passObj.onkeydown = inputObj.onkeydown;
		passObj.id = passId;
		passObj.type='password'; 
		inputObj.parentNode.replaceChild(passObj,inputObj);
		passObj.style.color = '#777'
		passObj.focus();
		passObj.focus();
	}
}

function openLogin(){
	if (loginOpen == true) { 
		if (document.frmLog.redirL.value==1) {
			displayStatFieldErr('frmLog', 'emailL', 'Please login to do a find.', '11', '');
		}else{
			displayStatFieldErr('frmLog', 'emailL', '', '11', '');
		}
	}else{
		location.href = '#login';
		var slideJs = new sliderJs;
		slideJs.divId = 'loginId';
		slideJs.moveDirection = 1;
		slideJs.initSlider();
		loginOpen = true;
	}
}

function validateLoginBox(){
	if (document.frmLog.passwordL.id.indexOf('Mock')>=0) document.frmLog.passwordL.value='';
	var objFrm = new validate();
	objFrm.formName = 'frmLog';
	objFrm.alertType = 0;
	objFrm.errorType = '1';
	objFrm.mandCaptions = new Array('Email address','Password');
	objFrm.mandFields =  new Array('emailL','passwordL');
	objFrm.mandFunc =  new Array('validateEmailAddr1', '');
	objFrm.emailL = new Array("","Enter a valid email address");
	objFrm.passwordL = new Array("Password cannot be left blank");
	if (objFrm.validateForm()) {
		checkLogin(0);
	}
	return false;
}

function validateEmailAddr1() {
	var emailAddr = document.frmLog.emailL.value;
	return validateEmail(emailAddr);
}

function checkLogin(demo) {
	var frmObj = document.frmLog;
	if (demo==2) {
	}else{
		showhide(1,'mLoginDiv');
	}
	var ajaxVar = new ajaxVars();
	ajaxVar.fnVars['demo'] = demo;
	ajaxVar.vars['email'] = (demo>0) ? "demo@buddi.co.uk" : frmObj.emailL.value;
	ajaxVar.vars['password'] = (demo>0) ? "demo123" :frmObj.passwordL.value;
	ajaxVar.vars['action'] = '';
	ajaxVar.gotoFunction = "loginUser";
	ajaxVar.phpFile = "/ax/memAuth.php";
	ajaxVar.AjaxPostSQL();
	
	return false;
}

function loginUser(dataArr, fnVars) {
	if (dataArr.length>0) {
		var xData = dataArr.split("#X#");
		if (xData[0]=='ERROR') {
			if(xData[2].indexOf("suspended")>=0){
				displayStatFieldErr('frmLog', 'emailL', xData[2], '11', '');
			}else{
				displayStatFieldErr('frmLog', 'emailL', 'Email/Password invalid', '11', '');
				
			}
			showhide(0,'mLoginDiv');
		}else{
			if (document.frmLog.redirL.value==1 || fnVars['demo']>0) {
				document.location.href = 'https://www.buddi.co.uk/index/find.php';
			}else{
				document.location.href = 'https://www.buddi.co.uk/index/login.php?xxoo=1268284228';
			}
		}
	}else{
		showhide(0,'mLoginDiv');
	}
}

function showMap(point){
	mapCont = document.getElementById('popupBox');
	mapCont.className = 'showBox popBox';
	generate_map(point);
}

function hideMap(){
	mapCont = document.getElementById('popupBox');
	mapCont.className = 'hideBox';
}

function generate_map(point){
	mymap = new map();
	mymap.divId = 'mapDiv';
	mymap.mapWidth = '600';
	mymap.mapHeight = '400';
	mymap.enableMarker = true;
	mymap.dragMarker = false;
	mymap.fence = false;
	mymap.saveToDB = false;
	mymap.tableName = 'tblGeo';
	mymap.org_id = 1;
	mymap.loadFence = false;
	mymap.centerPoint = point;

	mymap.printMap();
}

//used in setAlert
function IsNumeric(sText)
{
	var ValidChars = "0123456789.";
	var IsNumber=true;
	var Char;


	for (i = 0; i < sText.length && IsNumber == true; i++) { 
	  Char = sText.charAt(i); 
	  if (ValidChars.indexOf(Char) == -1) 
		 {
		 IsNumber = false;
		 }
	  }
	return IsNumber;

}

function checkbuddiPostCode (toCheck) {

  // Permitted letters depend upon their position in the postcode.
  var alpha1 = "[abcdefghijklmnoprstuwyz]";                       // Character 1
  var alpha2 = "[abcdefghklmnopqrstuvwxy]";                       // Character 2
  var alpha3 = "[abcdefghjkstuw]";                                // Character 3
  var alpha4 = "[abehmnprvwxy]";                                  // Character 4
  var alpha5 = "[abdefghjlnpqrstuwxyz]";                          // Character 5
  
  // Array holds the regular expressions for the valid postcodes
  var pcexp = new Array ();

  // Expression for postcodes: AN NAA, ANN NAA, AAN NAA, and AANN NAA
  pcexp.push (new RegExp ("^(" + alpha1 + "{1}" + alpha2 + "?[0-9]{1,2})(\\s*)([0-9]{1}" + alpha5 + "{2})$","i"));
  
  // Expression for postcodes: ANA NAA
  pcexp.push (new RegExp ("^(" + alpha1 + "{1}[0-9]{1}" + alpha3 + "{1})(\\s*)([0-9]{1}" + alpha5 + "{2})$","i"));

  // Expression for postcodes: AANA  NAA
  pcexp.push (new RegExp ("^(" + alpha1 + "{1}" + alpha2 + "?[0-9]{1}" + alpha4 +"{1})(\\s*)([0-9]{1}" + alpha5 + "{2})$","i"));
  
  // Exception for the special postcode GIR 0AA
  pcexp.push (/^(GIR)(\s*)(0AA)$/i);
  
  // Standard BFPO numbers
  pcexp.push (/^(bfpo)(\s*)([0-9]{1,4})$/i);
  
  // c/o BFPO numbers
  pcexp.push (/^(bfpo)(\s*)(c\/o\s*[0-9]{1,3})$/i);
  
  // Overseas Territories
  pcexp.push (/^([A-Z]{4})(\s*)(1ZZ)$/i);

  // Load up the string to check
  var postCode = toCheck;

  // Assume we're not going to find a valid postcode
  var valid = false;
  
  // Check the string against the types of post codes
  for ( var i=0; i<pcexp.length; i++) {
    if (pcexp[i].test(postCode)) {
    
      // The post code is valid - split the post code into component parts
      pcexp[i].exec(postCode);
      
      // Copy it back into the original string, converting it to uppercase and
      // inserting a space between the inward and outward codes
      postCode = RegExp.$1.toUpperCase() + " " + RegExp.$3.toUpperCase();
      
      // If it is a BFPO c/o type postcode, tidy up the "c/o" part
      postCode = postCode.replace (/C\/O\s*/,"c/o ");
      
      // Load new postcode back into the form element
      valid = true;
      
      // Remember that we have found that the code is valid and break from loop
      break;
    }
  }
  
  // Return with either the reformatted valid postcode or the original invalid 
  // postcode
  if (valid) {return postCode;} else return false;
}