function ChangeBgPic(id, mode) {
	if (mode == 1) {
		document.getElementById(id).style.backgroundImage = "url(images_layout/" + id + "a.jpg)";
	}
	else {
		document.getElementById(id).style.backgroundImage = "url(images_layout/" + id + ".jpg)";
	}
}
function ShowRoomPic(img_name) {
	var img = "images/" + img_name + ".jpg";
	document.getElementById("zimmerbild").src = img;
}