userAgent = window.navigator.userAgent;
browserVers = parseInt(userAgent.charAt(userAgent.indexOf("/")+1),10);
function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function findElement(n,ly) {
	if (browserVers < 4)		return document[n];
	var curDoc = ly ? ly.document : document;
	var elem = curDoc[n];
	if (!elem) {
		for (var i=0;i<curDoc.layers.length;i++) {
			elem = findElement(n,curDoc.layers[i]);
			if (elem) return elem;
		}
	}
	return elem;
}

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

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		info_over = newImage("images/info-over.gif");
		home_over = newImage("images/home-over.gif");
		team_over = newImage("images/team-over.gif");
		toegang_over = newImage("images/toegang-over.gif");
		fysio_over = newImage("images/fysio-over.gif");
		manueel_over = newImage("images/manueel-over.gif");
		acu_over = newImage("images/acu-over.gif");
		sport_over = newImage("images/sport-over.gif");
		hapto_over = newImage("images/hapto-over.gif");
		voet_over = newImage("images/voet-over.gif");
		drainage_over = newImage("images/drainage-over.gif");
		taping_over = newImage("images/taping-over.gif");
		oedeem_over = newImage("images/oedeem-over.gif");
		klachten_over = newImage("images/klachten-over.gif");
		tarieven_over = newImage("images/tarieven-over.gif");
		contact_over = newImage("images/contact-over.gif");
		preloadFlag = true;
	}
}