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_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 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_displayStatusMsg(msgStr) { //v1.0
  status=msgStr;
  document.MM_returnValue = true;
}

 function loadframe(frame,page)
{
 parent.frames[frame].location=page;
 }
 
  function loadframesitetree(frame,page)
{
 parent.frames.navigatie[frame].location=page;
 }

function MM_openBrWindow(theURL,winName,features) { //v2.0
theChild = window.open(theURL,winName,features);
}

<!-- functie voor het uitklappen van onderdelen
function show(rowID,Close,Open) {
 if (eval('tr'+rowID+'.className')=="hide") {
      eval('tr'+rowID+'.className="show"')
      eval('img'+rowID+'.src="'+Open+'"');
 }
 else {
      eval('tr'+rowID+'.className="hide"')
      eval('img'+rowID+'.src="'+Close+'"');
 }
}
//-->
<!-- functie voor het uitklappen van onderdelen
function hide(rowID,Close) {
      eval('tr'+rowID+'.className="hide"')
      eval('img'+rowID+'.src="'+Close+'"');
}
//-->

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_validateForm() { //v4.0
  var i,p,q,nm,test,num,min,max,errors='',args=MM_validateForm.arguments;
  for (i=0; i<(args.length-2); i+=3) { test=args[i+2]; val=MM_findObj(args[i]);
    if (val) { nm=val.name; if ((val=val.value)!="") {
      if (test.indexOf('isEmail')!=-1) { p=val.indexOf('@');
        if (p<1 || p==(val.length-1)) errors+='- '+nm+' moet een geldig e-mail adres bevatten.\n';
      } else if (test!='R') {
        if (isNaN(val)) errors+='- '+nm+' moet een nummer zijn.\n';
        if (test.indexOf('inRange') != -1) { p=test.indexOf(':');
          min=test.substring(8,p); max=test.substring(p+1);
          if (val<min || max<val) errors+='- '+nm+' moet een nummer zijn tussen '+min+' en '+max+'.\n';
    } } } else if (test.charAt(0) == 'R') errors += '- '+nm+' is verplicht.\n'; }
  } if (errors) alert('De volgende velden zijn niet goed ingevuld:\n'+errors);
  document.MM_returnValue = (errors == '');
}

function MM_jumpMenu(targ,selObj,restore){ //v3.0
  eval(targ+".location='"+selObj.options[selObj.selectedIndex].value+"'");
  if (restore) selObj.selectedIndex=0;
}

function MM_nbGroup(event, grpName) { //v6.0
  var i,img,nbArr,args=MM_nbGroup.arguments;
  if (event == "init" && args.length > 2) {
    if ((img = MM_findObj(args[2])) != null && !img.MM_init) {
      img.MM_init = true; img.MM_up = args[3]; img.MM_dn = img.src;
      if ((nbArr = document[grpName]) == null) nbArr = document[grpName] = new Array();
      nbArr[nbArr.length] = img;
      for (i=4; i < args.length-1; i+=2) if ((img = MM_findObj(args[i])) != null) {
        if (!img.MM_up) img.MM_up = img.src;
        img.src = img.MM_dn = args[i+1];
        nbArr[nbArr.length] = img;
    } }
  } else if (event == "over") {
    document.MM_nbOver = nbArr = new Array();
    for (i=1; i < args.length-1; i+=3) if ((img = MM_findObj(args[i])) != null) {
      if (!img.MM_up) img.MM_up = img.src;
      img.src = (img.MM_dn && args[i+2]) ? args[i+2] : ((args[i+1])? args[i+1] : img.MM_up);
      nbArr[nbArr.length] = img;
    }
  } else if (event == "out" ) {
    for (i=0; i < document.MM_nbOver.length; i++) {
      img = document.MM_nbOver[i]; img.src = (img.MM_dn) ? img.MM_dn : img.MM_up; }
  } else if (event == "down") {
    nbArr = document[grpName];
    if (nbArr)
      for (i=0; i < nbArr.length; i++) { img=nbArr[i]; img.src = img.MM_up; img.MM_dn = 0; }
    document[grpName] = nbArr = new Array();
    for (i=2; i < args.length-1; i+=2) if ((img = MM_findObj(args[i])) != null) {
      if (!img.MM_up) img.MM_up = img.src;
      img.src = img.MM_dn = (args[i+1])? args[i+1] : img.MM_up;
      nbArr[nbArr.length] = img;
  } }
}

// Deze code is voor de uitklapbare helpteksten in het online boeken formulier
function findLivePageWidth() {
	if (window.innerWidth != null)
		return window.innerWidth;
	if (document.body.clientWidth != null)
		return document.body.clientWidth;
	return (null);
}
	
function popUp(evt,objectID){
	if (isDHTML) { // Makes sure this is a DHTML browser
		var livePageWidth = findLivePageWidth();
		//alert(livePageWidth);
		domStyle = findDOM(objectID,1);
		dom = findDOM(objectID,0);
		state = domStyle.visibility;
		if (dom.offsetWidth) elemWidth = dom.offsetWidth;
		else { if (dom.clip.width)	elemWidth = dom.clip.width; }
		if (state == "visible" || state == "show")  { domStyle.visibility = "hidden"; }
		else {
			if (evt.pageY) { //Calculates the position for Navigator 4 
				topVal = evt.pageY + 4;
				leftVal = evt.pageX - (elemWidth / 2); 
			}
			else { 
				if (evt.y) { // Calculates the position for IE4
					topVal = evt.y + 4 + document.body.scrollTop;
					leftVal = evt.x - (elemWidth / 2) + document.body.scrollLeft;
				}
			}
		/*If the element goes off the page to the left, this moves it back */
			if(leftVal < 2) { leftVal = 2; }
			else { 
				if ((leftVal + elemWidth) > livePageWidth) { leftVal = leftVal - (elemWidth / 2); }
			}
			domStyle.top = topVal; // Positions the element from the top
			domStyle.left = leftVal; // Positions the element from the left
			domStyle.visibility = "visible"; // Makes the element visable 
		}
	}
}
// Einde code voor de uitklapbare helpteksten in het online boeken formulier