var layerOpen = false;

function hideLayers() {
	document.getElementById("menu").style.visibility = "hidden";
	for (var i = 1; i <= 10; i++) {
		document.getElementById("bild" + i.toString()).style.visibility = "hidden";
	}
}

function showLayer(id) {
	hideLayers();
	document.getElementById("bild" + id.toString()).style.visibility = "visible";
	document.getElementById("menu").style.visibility = "visible";
}