function preloadImages(urls) {
	var img = new Array();
	for (var i=0; i<urls.length; i++) {
		img[img.length]=new Image();
		img[img.length - 1].src=urls[i];
	}
}

function preload() {
    uri = window.location.href;
    if (uri.indexOf('#',0) > -1) { //have anchor
      uri = uri.replace(/.*#/, '');
      values = uri.split(',');
      changebg(values[0], values[1]);
    }
	var img = new Array('images/homebg.jpg', 'images/maatwerkbg.jpg', 'images/programmasbg.jpg', 'images/trainingbg.jpg', 'images/contactbg.jpg');
	preloadImages(img);

}