function checkMachtigingForm(form) {
	var needInfo = false;
	for (var i=0; i < form.elements.length; i++) {
    var element = form.elements[i];
    if (element.type == 'radio') {
    	if(element.value == 'ok' && element.checked) {
    		needInfo = true;
    	}
    }
	}
	if (needInfo == false) {
		return true;
	}
	if (form.rekeningnummer.value == "") {
		alert("Vul uw rekeningnummer in.");
		form.rekeningnummer.focus();
		return false;
	}
	if (parseInt(form.rekeningnummer.value) != form.rekeningnummer.value) {
		alert("Vul een geldig rekeningnummer in.");
		form.rekeningnummer.focus();
		return false;
	}
	if (form.ouders.value == "") {
		alert("Vul uw naam in.");
		form.ouders.focus();
		return false;
	}
	if (form.woonplaats.value == "") {
		alert("Vul uw woonplaats in.");
		form.woonplaats.focus();
		return false;
	}
	return true;
}

function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		home_over = newImage("/jsp/images/home_over.jpg");
		mijnjsp_over = newImage("/jsp/images/sport/mijnjsp_over.jpg");
		sporten_over = newImage("/jsp/images/sport/sporten_over.jpg");
		preloadFlag = true;
	}
}

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) { //v4.01
  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 toggleCategorie(what){
 if(document.getElementById(what).style.display == "none"){
   document.getElementById(what).style.display = "block";
   document.getElementById('image' + what).src = "/engine/images/minus.gif";
 }else{
   document.getElementById(what).style.display = "none";
   document.getElementById('image' + what).src = "/engine/images/plus.gif";
 }
}