function preload() {
	var preloaded = new Array();
	var images = new Array(
		'/images/backgrounds/producten.jpg',
		'/images/backgrounds/projecten.jpg',
		'/images/backgrounds/innovatie.jpg',
		'/images/backgrounds/nieuws.jpg',
		'/images/backgrounds/bedrijfsprofiel.jpg',
		'/images/backgrounds/contact.jpg'
	);
	for (i in images) {
		preloaded[i] = new Image()
		preloaded[i].src = images[i];
	}
}

function stretch_whitener() {
	var whitener = document.getElementById('whitener');
	if (whitener)
		whitener.style.height = document.body.scrollHeight + 'px';
}