function FP_preloadImgs() {//v1.0
  var d=document,a=arguments;
  if(!d.FP_imgs) d.FP_imgs=new Array();
  for(var i=0; i<a.length; i++)
  {
    d.FP_imgs[i]=new Image;
    d.FP_imgs[i].src=a[i];
  }
}

function FP_swapImg() {//v1.0
  var doc=document,args=arguments,elm,n;
  doc.$imgSwaps=new Array();
  for(n=2;n<args.length;n+=2)
  {
    elm=FP_getObjectByID(args[n]);
    if(elm)
    {
      doc.$imgSwaps[doc.$imgSwaps.length]=elm;
      elm.$src=elm.src;
      elm.src=args[n+1];
   }
  }
}

function FP_getObjectByID(id,o) {//v1.0
  var c,el,els,f,m,n;
  if(!o)
    o=document;
  if(o.getElementById)
    el=o.getElementById(id);
  else if(o.layers)
    c=o.layers;
  else if(o.all)
    el=o.all[id];
  if(el)
    return el;
  if(o.id==id || o.name==id)
    return o;
  if(o.childNodes)
    c=o.childNodes;
  if(c)
    for(n=0; n<c.length; n++)
    {
      el=FP_getObjectByID(id,c[n]);
      if(el)
        return el;
    }
  f=o.forms;
  if(f)
    for(n=0; n<f.length; n++)
    {
      els=f[n].elements;
      for(m=0; m<els.length; m++)
      {
        el=FP_getObjectByID(id,els[n]);
        if(el)
          return el;
      }
    }
  return null;
}

function displayPanel(id)
{
	var ht=screen.height;
	var wt=screen.width;
	document.getElementById(id).style.left = (wt-325)/2;
	document.getElementById(id).style.top =((ht*0.85)-125)/2;
	document.getElementById(id).style.visibility = "visible";
}

function closePanel(id)
{
	document.getElementById(id).style.visibility = "hidden";
}

function DisplayList(elmt)
{
	document.all(elmt).style.visibility = "visible";
}

function HideList(elmt)
{
	document.all(elmt).style.visibility = "hidden";
}

function maskInteger(objEvent) 
{
	var iKeyCode;  	
	iKeyCode = objEvent.keyCode;			
	if(iKeyCode>=48 && iKeyCode<=57) return true;
	return false;
}

function maskDecimal(objEvent,val) 
{
	var iKeyCode;  	
	iKeyCode = objEvent.keyCode;			
	if(iKeyCode>=48 && iKeyCode<=57)
		return true;
	if(iKeyCode==46 && val.indexOf('.')<0 && val.length>0)
		return true;

	return false;
}

function checkLoginFrm(form)
{
	var uname = form.fwcuname.value;
	var pword = form.fwcpword.value;
	
	if(uname == '' || uname.length==0)
	{
		alert('Please enter username.');
		return false;
	}
	else if(uname.length>20)
	{
		alert('Username is more than 20 characters long.\nUsername should be less than 20 characters long.');
		return false;
	}
	else if(pword == '')
	{
		alert('Please enter password.');
		return false;
	}
	else if(pword.length<6)
	{
		alert('Password is less than 6 characters long.\nPassword should be 6 - 10 characters long.');
		return false;
	}
	else if(pword.length>10)
	{
		alert('Password is more than 10 characters long.\nPassword should be 6 - 10 characters long.');
		return false;
	}
	else
		return true;
}

function checkResetPWFrm(form)
{
	var nric = form.fwcnric.value;
	var email = form.fwcemail.value;
			
	if(nric == '')
	{
		alert('Please enter your NRIC/FIN number.');
		return false;
	}
	else if(!emailCheck(email))
	{
		return false;
	}
	else
		return true;
}

function checkEditPWFrm(form)
{
	var pw1 = form.fwcpword1.value;
	var pw2 = form.fwcpword2.value;
	
	if(pw1.length<6 || pw1.length>10 || pw2.length<6 || pw2.length>10)
	{
		alert("Please ensure that your password is between 6 to 10 characters long.");
		return false;
	}
	
	if(pw1 != pw2)
	{
		alert("You have not entered the same password twice!\nPlease re-enter the same password twice.");
		return false;
	}
	return true;
}

function PopUp(mypage, myname, w, h, scroll)
{
  var winl = (screen.width - w) / 2;
  var wint = (screen.height - h) / 2;
  winprops = 'height='+h+',width='+w+',top='+wint+',left='+winl+',scrollbars='+scroll+',resizable=0'
  win = window.open(mypage, myname, winprops)
  if (parseInt(navigator.appVersion) >= 4) { win.window.focus(); }
}

function emailCheck (emailStr) {

/* 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("Email address seems incorrect (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("Ths username contains invalid characters.");
return false;
   }
}
for (i=0; i<domain.length; i++) {
if (domain.charCodeAt(i)>127) {
alert("Ths domain name contains invalid characters.");
return false;
   }
}

// See if "user" is valid

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

// user is not valid

alert("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("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("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("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("This address is missing a hostname!");
return false;
}

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

}

//START: checkDate
function daysInFebruary (year){
	// February has 29 days in any year evenly divisible by four,
	// EXCEPT for centurial years which are not also divisible by 400.
	return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}
function DaysArray() {
	for (var i = 1; i <= 12; i++) {
		this[i] = 31
		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
		if (i==2) {this[i] = 29}
   }
   return this
}
function checkDate(strDay, strMonth, strYr)
{
	var daysInMonth = DaysArray()


	month=parseInt(strMonth)
	day=parseInt(strDay)
	year=parseInt(strYr)

	/*
    if (strMonth.length<1 || month<1 || month>12){
		alert("Please enter a valid month")
		return false
	}*/
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		alert("Please enter a valid day")
		return false
	}
    
	return true
}
//END: checkDate

//--------------------------------------------------------------------
// -------------------- PROMPTS FOR PORTAL ---------------------------
//--------------------------------------------------------------------


function promptLoginError()
{
	alert("Sorry, you have entered an invalid username and password.");
}

function promptResetSuccessful()
{
	alert("Your password has been successfully changed.\nYou will receive an email shortly with your new password.");
}

function promptResetError()
{
	alert("There has been an error while resetting your password.\nPlease try again later.");
}

function promptResetNotFound()
{
	alert("Sorry, the system is unable to find an account with the NRIC/FIN number and email address which you have provided.\nWe are unable to reset your password.");
}

function promptEditPWSuccessful()
{
	alert("Your password has been updated successfully.\nYou may now use this password to access the Fun Walkers @ South West Portal.");
}

function promptEditPWUnsuccessful()
{
	alert("The update of your password was not successful.\nPlease try again.");
}
function promptUpdateSurvey()
{
	alert("It has been more than 6 months since you last took the health survey questionnaire.\nPlease update it now.");
	window.location = '/funwalkers/healthsurvey.jsp';
}