function aufklappen(element) {
	if (document.getElementById(element).style.display == "none") {
		document.getElementById(element).style.display = "block";
	}
	else {
		document.getElementById(element).style.display = "none";
	}
}

function zuklappen(element) {
	if (document.getElementById(element).style.display == "block") {
		document.getElementById(element).style.display = "none";
	}
}

function geschichte()
{
document.getElementById('bild1').style.display = "block";
document.getElementById('bild2').style.display = "none";
document.getElementById('bild3').style.display = "none";
document.getElementById('bild4').style.display = "none";
document.getElementById('bild5').style.display = "none";
}

function qualitaet()
{
document.getElementById('bild1').style.display = "none";
document.getElementById('bild2').style.display = "block";
document.getElementById('bild3').style.display = "none";
document.getElementById('bild4').style.display = "none";
document.getElementById('bild5').style.display = "none";
}

function umwelt()
{
document.getElementById('bild1').style.display = "none";
document.getElementById('bild2').style.display = "none";
document.getElementById('bild3').style.display = "block";
document.getElementById('bild4').style.display = "none";
document.getElementById('bild5').style.display = "none";
}

function fahrzeuge()
{
document.getElementById('bild1').style.display = "none";
document.getElementById('bild2').style.display = "none";
document.getElementById('bild3').style.display = "none";
document.getElementById('bild4').style.display = "block";
document.getElementById('bild5').style.display = "block";
}