/***********************************************
* Switch Content script- © Dynamic Drive (www.dynamicdrive.com)
* This notice must stay intact for legal use. Last updated April 2nd, 2005.
* Visit http://www.dynamicdrive.com/ for full source code
***********************************************/

var enablepersist="on" //Enable saving state of content structure using session cookies? (on/off)
var collapseprevious="no" //Collapse previously open content when opening present? (yes/no)

var contractsymbol='- ' //HTML for contract symbol. For image, use: <img src="whatever.gif">
var expandsymbol='+ ' //HTML for expand symbol.


if (document.getElementById){
document.write('<style type="text/css">')
document.write('.switchcontent{display:none;}')
document.write('</style>')
}

function getElementbyClass(rootobj, classname){
var temparray=new Array()
var inc=0
var rootlength=rootobj.length
for (i=0; i<rootlength; i++){
if (rootobj[i].className==classname)
temparray[inc++]=rootobj[i]
}
return temparray
}

function sweeptoggle(ec){
var thestate=(ec=="expand")? "block" : "none"
var inc=0
while (ccollect[inc]){
ccollect[inc].style.display=thestate
inc++
}
revivestatus()
}


function contractcontent(omit){
var inc=0
while (ccollect[inc]){
if (ccollect[inc].id!=omit)
ccollect[inc].style.display="none"
inc++
}
}

function expandcontent(curobj, cid){
var spantags=curobj.getElementsByTagName("SPAN")
var showstateobj=getElementbyClass(spantags, "showstate")
if (ccollect.length>0){
if (collapseprevious=="yes")
contractcontent(cid)
document.getElementById(cid).style.display=(document.getElementById(cid).style.display!="block")? "block" : "none"
if (showstateobj.length>0){ //if "showstate" span exists in header
if (collapseprevious=="no")
showstateobj[0].innerHTML=(document.getElementById(cid).style.display=="block")? contractsymbol : expandsymbol
else
revivestatus()
}
}
}

function revivecontent(){
contractcontent("omitnothing")
selectedItem=getselectedItem()
selectedComponents=selectedItem.split("|")
for (i=0; i<selectedComponents.length-1; i++)
document.getElementById(selectedComponents[i]).style.display="block"
}

function revivestatus(){
var inc=0
while (statecollect[inc]){
if (ccollect[inc].style.display=="block")
statecollect[inc].innerHTML=contractsymbol
else
statecollect[inc].innerHTML=expandsymbol
inc++
}
}

function get_cookie(Name) { 
var search = Name + "="
var returnvalue = "";
if (document.cookie.length > 0) {
offset = document.cookie.indexOf(search)
if (offset != -1) { 
offset += search.length
end = document.cookie.indexOf(";", offset);
if (end == -1) end = document.cookie.length;
returnvalue=unescape(document.cookie.substring(offset, end))
}
}
return returnvalue;
}

function getselectedItem(){
if (get_cookie(window.location.pathname) != ""){
selectedItem=get_cookie(window.location.pathname)
return selectedItem
}
else
return ""
}

function saveswitchstate(){
var inc=0, selectedItem=""
while (ccollect[inc]){
if (ccollect[inc].style.display=="block")
selectedItem+=ccollect[inc].id+"|"
inc++
}

document.cookie=window.location.pathname+"="+selectedItem
}

function do_onload(){
uniqueidn=window.location.pathname+"firsttimeload"
var alltags=document.all? document.all : document.getElementsByTagName("*")
ccollect=getElementbyClass(alltags, "switchcontent")
statecollect=getElementbyClass(alltags, "showstate")
if (enablepersist=="on" && ccollect.length>0){
document.cookie=(get_cookie(uniqueidn)=="")? uniqueidn+"=1" : uniqueidn+"=0" 
firsttimeload=(get_cookie(uniqueidn)==1)? 1 : 0 //check if this is 1st page load
if (!firsttimeload)
revivecontent()
}
if (ccollect.length>0 && statecollect.length>0)
revivestatus()
}

if (window.addEventListener)
window.addEventListener("load", do_onload, false)
else if (window.attachEvent)
window.attachEvent("onload", do_onload)
else if (document.getElementById)
window.onload=do_onload

if (enablepersist=="on" && document.getElementById)
window.onunload=saveswitchstate;

///////

function MM_reloadPage(init) {  //reloads the window if Nav4 resized
  if (init==true) with (navigator) {if ((appName=="Netscape")&&(parseInt(appVersion)==4)) {
    document.MM_pgW=innerWidth; document.MM_pgH=innerHeight; onresize=MM_reloadPage; }}
  else if (innerWidth!=document.MM_pgW || innerHeight!=document.MM_pgH) location.reload();
}
MM_reloadPage(true);

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_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_findObj(n, d) { //v4.01
  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 && d.getElementById) x=d.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 LoadImages (){
	MM_preloadImages('images/knop-overkvanred_02.gif','images/knop-overkvanover_03.gif','images/knop-overkvanover_04.gif','images/knop-overkvanred_05.gif','images/knop-overkvanred_03.gif','images/knop-overkvanred_01.gif','images/knop-overkvanover_02.gif','images/knop-overkvanred_04.gif','images/knop-sectiesred_01.gif','images/knop-sectiesover_02.gif','images/knop-sectiesred_03.gif','images/knop-sectiesred_04.gif','images/knop-sectiesred_05.gif','images/knop-sectiesred_02.gif','images/knop-sectiesover_03.gif','images/knop-sectiesover_04.gif','images/knop-almanak_over.gif','images/knop-archievenblad_over.gif','images/knop-studiedagen_over.gif','images/knop-links_over.gif','images/knop-snaai_over.gif','images/knop-sap_over.gif','images/knop-ethischecode_over.gif','images/knop-nieuws_01.gif','images/knop-nieuws_02.gif','images/knop-nieuws_03.gif','images/knop-nieuws_04.gif','images/knop-nieuwsoverwit_02.gif','images/knop-nieuwsoverwit_03.gif','knop-nieuwsblue_01.gif','knop-nieuwsblue_02.gif','knop-nieuwsblue_03.gif','knop-nieuwsblue_04.gif','knop-studiedagen_01.gif','knop-studiedagen_02.gif','knop-studiedagen_03.gif','knop-studiedagen_04.gif','knop-studiedagen_05.gif','knop-studiedagenblue_01.gif','knop-studiedagenblue_02.gif','knop-studiedagenblue_03.gif','knop-studiedagenblue_04.gif','knop-studiedagenblue_05.gif','knop-studiedagenover_02.gif','knop-studiedagenover_03.gif','knop-studiedagenover_04.gif','knop-studiedagenoverwit_02.gif','knop-studiedagenoverwit_03.gif','knop-studiedagenoverwit_04.gif');
	}
	function LoadImagesHome(){
MM_preloadImages('images/knophome-sectiesred01.gif','images/knophome-sectiesred02.gif','images/knophome-sectiesred03.gif','images/knophome-sectiesred04.gif','images/knophome-sectiesred05.gif','images/knophome-sectiesover02.gif','images/knophome-sectiesover03.gif','images/knophome-sectiesover04.gif','images/knophome-overkvanred01.gif','images/knophome-overkvanred02.gif','images/knophome-overkvanred03.gif','images/knophome-overkvanred04.gif','images/knophome-overkvanred05.gif','images/knophome-overkvanover04.gif', 'images/knophome-overkvanred01.gif','images/knophome-overkvanover02.gif','images/knophome-overkvanover03.gif');
	}