function oeffnen(punkt,nav) {

	document.getElementById(punkt).style.visibility = "visible";
	document.getElementById(nav).style.visibility = "visible";
}
	
function schliessen() {
	
	document.getElementById('M01').style.visibility="hidden";
	document.getElementById('M02').style.visibility="hidden";
	document.getElementById('M03').style.visibility="hidden";
	document.getElementById('M04').style.visibility="hidden";
	document.getElementById('M06').style.visibility="hidden";	
	document.getElementById('M07').style.visibility="hidden";
	document.getElementById('M08').style.visibility="hidden";
	document.getElementById('M09').style.visibility="hidden";
	document.getElementById('M10').style.visibility="hidden";
	document.getElementById('M11').style.visibility="hidden";
}
function color_over(point) {

	document.getElementById(point).style.backgroundColor="#373b46";
	
}
function color_out(point) {

	document.getElementById(point).style.backgroundColor="#111521";
	
}