// Klappt Beschreibungen auf und zu
function angebot_slayer(layer_id) {
	var next_state = "";
	elem = document.getElementById("angebot_layer" + layer_id);
	if (elem.style.display == "block") next_state = "none"
	else next_state = "block";
	elem.style.display = next_state;
	return false;
}