function mapChange(){
	var SelecMap = document.getElementById("submenu2");
	switch(SelecMap.value)
	{
	case "zurich":
	  document.getElementById("mapZurich").style.display = "block";
	  document.getElementById("mapStmoritz").style.display = "none";
	  document.getElementById("mapLugano").style.display = "none";
	  break    
	case "moritz":
	  document.getElementById("mapZurich").style.display = "none";
	  document.getElementById("mapStmoritz").style.display = "block";
	  document.getElementById("mapLugano").style.display = "none";
	  break
	case "lugano":
	  document.getElementById("mapZurich").style.display = "none";
	  document.getElementById("mapStmoritz").style.display = "none";
	  document.getElementById("mapLugano").style.display = "block";
	  break
	}
}