var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		pre_tageszentrum_a = newImage('images/buttons/tageszentrum_a.jpg');
		pre_scheune_a = newImage('images/buttons/scheune_a.jpg');
		pre_home_a = newImage('../images/buttons/home_a.jpg');
		preloadFlag = true;
	}
}