function fade_in(objekt, objektDelay) {
	new Effect.Opacity(objekt, { from: 0, to: 1, duration: 0.2, delay: objektDelay});
}
function fade_out() {
	$('detail_image').setOpacity(0); $('detail_image').style.visibility = 'visible';
}
function image_rendern() {
	fade_out();
	fade_in('detail_image', 0)
}