var currLayer = '';

function showBild(bild){
	//Alten Layer schließen
	if(currLayer != ''){
		document.getElementById(currLayer).style.display = 'none';
		currLayer = '';
	}
	document.getElementById('bild').style.display = 'block';
	document.getElementById('bild').style.backgroundImage='url(images/'+bild+')'; 
}


function showLayer(id){	
	//Standardwert
	if(!id) id='daten';
	
	//Alten Layer schließen
	if(currLayer != ''){
		document.getElementById(currLayer).style.display = 'none';
		currLayer = '';
	}
	document.getElementById('bild').style.display = 'none';
	document.getElementById(id).style.display = 'block';
	currLayer = id;
}