function showNav(nav, showSubnav) {
	
	if(nav == 'Startseite'){
		document.getElementById('subnav-Startseite').style.visibility = "visible";
		document.getElementById('subnav-Struktur').style.visibility = "hidden";
		document.getElementById('subnav-Portrait').style.visibility = "hidden";
		document.getElementById('subnav-Bereiche').style.visibility = "hidden";
		document.getElementById('subnav-Kontakt').style.visibility = "hidden";
	}else if(nav == 'Struktur'){
		document.getElementById('subnav-Startseite').style.visibility = "hidden";
		document.getElementById('subnav-Struktur').style.visibility = "visible";
		document.getElementById('subnav-Portrait').style.visibility = "hidden";
		document.getElementById('subnav-Bereiche').style.visibility = "hidden";
		document.getElementById('subnav-Kontakt').style.visibility = "hidden";
	}else if(nav == 'Portrait'){
		document.getElementById('subnav-Startseite').style.visibility = "hidden";
		document.getElementById('subnav-Struktur').style.visibility = "hidden";
		document.getElementById('subnav-Portrait').style.visibility = "visible";
		document.getElementById('subnav-Bereiche').style.visibility = "hidden";
		document.getElementById('subnav-Kontakt').style.visibility = "hidden";
	}else if (nav == 'Bereiche'){
		document.getElementById('subnav-Startseite').style.visibility = "hidden";
		document.getElementById('subnav-Struktur').style.visibility = "hidden";
		document.getElementById('subnav-Portrait').style.visibility = "hidden";
		document.getElementById('subnav-Bereiche').style.visibility = "visible";
		document.getElementById('subnav-Kontakt').style.visibility = "hidden";
	}else if (nav == 'Kontakt'){
		document.getElementById('subnav-Startseite').style.visibility = "hidden";
		document.getElementById('subnav-Struktur').style.visibility = "hidden";
		document.getElementById('subnav-Portrait').style.visibility = "hidden";
		document.getElementById('subnav-Bereiche').style.visibility = "hidden";
		document.getElementById('subnav-Kontakt').style.visibility = "visible"
	}else {
		document.getElementById('subnav-Startseite').style.visibility = "hidden";
		document.getElementById('subnav-Struktur').style.visibility = "hidden";
		document.getElementById('subnav-Portrait').style.visibility = "hidden";
		document.getElementById('subnav-Bereiche').style.visibility = "hidden";
		document.getElementById('subnav-Kontakt').style.visibility = "hidden";
	}
}