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) {
		homepagebutton_over = newImage("images/homepagebutton_over.jpg");
		aboutusbutton_over = newImage("images/aboutusbutton_over.jpg");
		menubutton_over = newImage("images/menubutton_over.jpg");
		functionsbutton_over = newImage("images/functionsbutton_over.jpg");
		eventsbutton_over = newImage("images/eventsbutton_over.jpg");
		revieuwsbutton_over = newImage("revieuwsbutton_over.jpg");
		recipebutton_over = newImage("images/recipebutton_over.jpg");
		cateringbutton_over = newImage("images/cateringbutton_over.jpg");
		contactbutton_over = newImage("images/contactbutton_over.jpg");
		preloadFlag = true;
	}
}