function showNav(nav, showSubnav) {
	
	if(nav == 'home'){
		document.getElementById('subnav-home').style.visibility = "visible";
		document.getElementById('subnav-ueber_uns').style.visibility = "hidden";
		document.getElementById('subnav-kontakt').style.visibility = "hidden";
		document.getElementById('subnav-service').style.visibility = "hidden";
		document.getElementById('subnav-fahrzeug').style.visibility = "hidden";
		document.getElementById('subnav-werbung').style.visibility = "hidden";
		document.getElementById('subnav-events').style.visibility = "hidden";
	}else if(nav == 'ueber_uns'){
		document.getElementById('subnav-home').style.visibility = "hidden";
		document.getElementById('subnav-ueber_uns').style.visibility = "visible";
		document.getElementById('subnav-kontakt').style.visibility = "hidden";
		document.getElementById('subnav-service').style.visibility = "hidden";
		document.getElementById('subnav-fahrzeug').style.visibility = "hidden";
		document.getElementById('subnav-werbung').style.visibility = "hidden";
		document.getElementById('subnav-events').style.visibility = "hidden";
	}else if(nav == 'kontakt'){
		document.getElementById('subnav-home').style.visibility = "hidden";
		document.getElementById('subnav-ueber_uns').style.visibility = "hidden";
		document.getElementById('subnav-kontakt').style.visibility = "visible";
		document.getElementById('subnav-service').style.visibility = "hidden";
		document.getElementById('subnav-fahrzeug').style.visibility = "hidden";
		document.getElementById('subnav-werbung').style.visibility = "hidden";
		document.getElementById('subnav-events').style.visibility = "hidden";
	}else if (nav == 'service'){
		document.getElementById('subnav-home').style.visibility = "hidden";
		document.getElementById('subnav-ueber_uns').style.visibility = "hidden";
		document.getElementById('subnav-kontakt').style.visibility = "hidden";
		document.getElementById('subnav-service').style.visibility = "visible";
		document.getElementById('subnav-fahrzeug').style.visibility = "hidden";
		document.getElementById('subnav-werbung').style.visibility = "hidden";
		document.getElementById('subnav-events').style.visibility = "hidden";
	}else if (nav == 'fahrzeug'){
		document.getElementById('subnav-home').style.visibility = "hidden";
		document.getElementById('subnav-ueber_uns').style.visibility = "hidden";
		document.getElementById('subnav-kontakt').style.visibility = "hidden";
		document.getElementById('subnav-service').style.visibility = "hidden";
		document.getElementById('subnav-fahrzeug').style.visibility = "visible";
		document.getElementById('subnav-werbung').style.visibility = "hidden";
		document.getElementById('subnav-events').style.visibility = "hidden";
	}else if (nav == 'werbung'){
		document.getElementById('subnav-home').style.visibility = "hidden";
		document.getElementById('subnav-ueber_uns').style.visibility = "hidden";
		document.getElementById('subnav-kontakt').style.visibility = "hidden";
		document.getElementById('subnav-service').style.visibility = "hidden";
		document.getElementById('subnav-fahrzeug').style.visibility = "hidden";
		document.getElementById('subnav-werbung').style.visibility = "visible";
		document.getElementById('subnav-events').style.visibility = "hidden";
	}else if (nav == 'events'){
		document.getElementById('subnav-home').style.visibility = "hidden";
		document.getElementById('subnav-ueber_uns').style.visibility = "hidden";
		document.getElementById('subnav-kontakt').style.visibility = "hidden";
		document.getElementById('subnav-service').style.visibility = "hidden";
		document.getElementById('subnav-fahrzeug').style.visibility = "hidden";
		document.getElementById('subnav-werbung').style.visibility = "hidden";
		document.getElementById('subnav-events').style.visibility = "visible";
	}else {
		document.getElementById('subnav-home').style.visibility = "hidden";
		document.getElementById('subnav-ueber_uns').style.visibility = "hidden";
		document.getElementById('subnav-kontakt').style.visibility = "hidden";
		document.getElementById('subnav-service').style.visibility = "hidden";
		document.getElementById('subnav-fahrzeug').style.visibility = "hidden";
		document.getElementById('subnav-werbung').style.visibility = "hidden";
		document.getElementById('subnav-events').style.visibility = "hidden";
	}
}