function referenzen_1(){
	document.getElementById('button-2-menu').style.visibility='hidden';
	document.getElementById('button-3-menu').style.visibility='hidden'; 
	document.getElementById('button-4-menu').style.visibility='hidden';
	document.getElementById('button-5-menu').style.visibility='hidden';
}
function kontakt_1(){
	document.getElementById('button-2-menu').style.visibility='hidden';
	document.getElementById('button-3-menu').style.visibility='hidden'; 
	document.getElementById('button-4-menu').style.visibility='hidden';
	document.getElementById('button-5-menu').style.visibility='hidden';
}
function partner_1(){
	document.getElementById('button-2-menu').style.visibility='hidden';
	document.getElementById('button-3-menu').style.visibility='hidden'; 
	document.getElementById('button-4-menu').style.visibility='hidden';
	document.getElementById('button-5-menu').style.visibility='hidden';
}
function links_1(){
	document.getElementById('button-2-menu').style.visibility='hidden';
	document.getElementById('button-3-menu').style.visibility='hidden'; 
	document.getElementById('button-4-menu').style.visibility='hidden';
	document.getElementById('button-5-menu').style.visibility='hidden';
}
function impressum_1(){
	document.getElementById('button-2-menu').style.visibility='hidden';
	document.getElementById('button-3-menu').style.visibility='hidden'; 
	document.getElementById('button-4-menu').style.visibility='hidden';
	document.getElementById('button-5-menu').style.visibility='hidden';
}