function doIChangeTree(sourceID,targetID,imageID){
	var tid = document.getElementById(targetID);
	var s = document.getElementById(sourceID).innerHTML;	
	var x = document.getElementById(imageID);
	if (s == "+"){   
		s = "- ";
		tid.style.display = "";
		x.src = "images/folderopen.gif";
	}
	else{
		s = "+";
		tid.style.display = "none";
		x.src = "images/folderclosed.gif";
	}
	alterContent(sourceID,s);
}

function alterContent(dContent,myContent){
	if (document.all)
		document.getElementById(dContent).innerHTML=myContent;
	else if (document.getElementById){
		rng = document.createRange();
		el = document.getElementById(dContent);
		rng.setStartBefore(el);
		htmlFrag = rng.createContextualFragment(myContent);
		while (el.hasChildNodes()) el.removeChild(el.lastChild);
		el.appendChild(htmlFrag);
	}
}

function doIXChangeTree(sourceID,targetID,imageID){
	var s = sourceID.innerHTML;	
	var x = document.getElementById(imageID);
	if (s == '+'){   
		x.src = "images/folderopen.gif";
		s = '- ';
		targetID.style.display = "";
	}
	else{
		x.src = "images/folderclosed.gif";
		s = '+';
		targetID.style.display = "none";
	}
	sourceID.innerHTML = s;
}

function doChangeTree(sourceID,targetID){
	var tid = document.getElementById(targetID);
	var s = document.getElementById(sourceID).innerHTML;
	if (s.charAt(0) == '+'){
		s = '-' + s.substr(1);
		tid.style.display = "";
	}
	else{
		s = '+' + s.substr(1);
		tid.style.display = "none";
	}
	alterContent(sourceID,s);
}

function doXChangeTree(sourceID,targetID){
	var s = sourceID.innerHTML;
	if (s.charAt(0) == '+'){
		s = '-' + s.substr(1);
		targetID.style.display = "";
	}
	else{
		s = '+' + s.substr(1);
		targetID.style.display = "none";
	}
	sourceID.innerHTML = s;
}

function doShowHide(sourceID,targetID){
	var i,n = 'show',r = 'hide',s = document.getElementById(sourceID).innerHTML;
	var tid = document.getElementById(targetID);
	i = s.indexOf(n);
	if (i < 0){
		n = 'Show';
		r = 'Hide';
		i = s.indexOf(n);
	}
	if (i < 0){
		n = 'hide';
		r = 'show';
		i = s.indexOf(n);
	}
	if (i < 0){
		n = 'Hide';
		r = 'Show';
		i = s.indexOf(n);
	}
	if (tid.style.display == "none"){
		tid.style.display = "";
	}
	else{
		tid.style.display = "none";
	}
	if (i >= 0){
		alterContent(sourceID,s.replace(n,r));
	}
}

function doXShowHide(sourceID,targetID){
	var i,n = 'show',r = 'hide',s = sourceID.innerHTML;
	i = s.indexOf(n);
	if (i < 0){
		n = 'Show';
		r = 'Hide';
		i = s.indexOf(n);
	}
	if (i < 0){
		n = 'hide';
		r = 'show';
		i = s.indexOf(n);
	}
	if (i < 0){
		n = 'Hide';
		r = 'Show';
		i = s.indexOf(n);
	}
	if (targetID.style.display == "none"){
		targetID.style.display = "";
	}
	else{
		targetID.style.display = "none";
	}
	if (i >= 0){
		sourceID.innerHTML = s.replace(n,r);
	}
}

function doSubmitMainForm(iBTrail,sHRef)
{
	var theForm = document.MainForm;
	theForm.btrail.value = iBTrail;
	theForm.action = sHRef;
	theForm.submit();
}

var copymessage = "This image is subject to copyright and cannot be used without prior permission or purchase.";

function doCopyright(e){
	if (document.all) {
		if (event.button==2||event.button==3) {
			alert(copymessage);
			return (false);
		}
	} else if(document.layers||document.getElementById) {
		if (e.which == 3) {
			alert(copymessage);
			return (false);
		}
	}
}

function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_findObj(n, d) { //v4.0
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && document.getElementById) x=document.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}

function addToFavorites() { //adds page to favourites. only works in selected browsers
	var strUrl=window.location.href;
	if (window.external) {
		window.external.AddFavorite(strUrl,"<%=strPageTitle%>")
	} else { 
		alert("Sorry! Your browser does not support this function.");
	}
}

function Keyword_Form_Validator(theForm)
{
  if (theForm.Keyword.value == "")
  {
    alert("Please enter a value for the Keyword.");
    theForm.Keyword.focus();
    return (false);
  }
  if (theForm.Keyword.value.length < 2)
  {
    alert("Please enter at least 2 characters for the Keyword.");
    theForm.Keyword.focus();
    return (false);
  }
  if (theForm.Keyword.value.length > 50)
  {
    alert("Please enter a maximum of 50 characters for the Keyword.");
    theForm.Keyword.focus();
    return (false);
  }
}

function Login_Form_Validator(theForm)
{
  if (theForm.UserName.value == "")
  {
    alert("Please enter a value for your User Name.");
    theForm.UserName.focus();
    return (false);
  }
  if (theForm.UserName.value.length < 6)
  {
    alert("Please enter at least 6 characters for your User Name.");
    theForm.UserName.focus();
    return (false);
  }
  if (theForm.UserName.value.length > 20)
  {
    alert("Please enter a maximum of 20 characters for your User Name.");
    theForm.UserName.focus();
    return (false);
  }
  if (theForm.PWord.value == "")
  {
    alert("Please enter a value for your Password.");
    theForm.PWord.focus();
    return (false);
  }
  if (theForm.PWord.value.length < 5)
  {
    alert("Please enter at least 5 characters for your Password.");
    theForm.PWord.focus();
    return (false);
  }
  if (theForm.PWord.value.length > 20)
  {
    alert("Please enter a maximum of 20 characters for your Password.");
    theForm.PWord.focus();
    return (false);
  }
}

function IsValidEmailAddress(strEmailAddress) {
// this function checks if an email address is valid
	var emailStr = strEmailAddress;
	var emailPat=/^(.+)@(.+)$/;
	var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]";
	var validChars="\[^\\s" + specialChars + "\]";
	var quotedUser="(\"[^\"]*\")";
	var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;
	var atom=validChars + '+';
	var word="(" + atom + "|" + quotedUser + ")";
	var userPat=new RegExp("^" + word + "(\\." + word + ")*$");
	var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$");
	var matchArray=emailStr.match(emailPat)
	if (matchArray==null) {
		return  (false);
	}
	var user=matchArray[1];
	var domain=matchArray[2];
	if (user.match(userPat)==null) {
		return (false);
	}
	var IPArray=domain.match(ipDomainPat);
	if (IPArray!=null) {
		for (var i=1;i<=4;i++) {
			if (IPArray[i]>255) {
				return (false);
			}
		}
	}
	var domainArray=domain.match(domainPat);
	if (domainArray==null) {
		return (false);
	}
	var atomPat=new RegExp(atom,"g");
	var domArr=domain.match(atomPat);
	var len=domArr.length;
	if (domArr[domArr.length-1].length<2 || domArr[domArr.length-1].length>4) {
		return (false);
	}
	if (len<2) {
		return (false);
	}
	return (true);
}

function textLimiter(field, maxlimit)
{
	if (field.value.length > maxlimit)	{
		field.value = field.value.substring(0, maxlimit);
		alert("The text entered has exceeded the maximum allowed for this field.");
	}
}

function integerOnly(field)
{
	var pat = new RegExp(/[^0-9]/);
	if (pat.test(field.value)||field.value.length == 0){
		field.value = 1;
		alert("This field can only contain numeric characters (0 to 9)");
	}
}

function doNotLoggedIn(){
	alert("Please Login to use this feature.");
}

function doNotAvailable(){
	alert("This function is currently not available.");
}