function apartment() {
	document.getElementById("grossbild-apartment").style.display = 'inline';
	document.getElementById("grossbild-doppelzimmer").style.display = 'none';
	document.getElementById("grossbild-einzelzimmer").style.display = 'none';
	document.getElementById("gross-title1").style.background = 'url(/images/trans-blue.png) repeat';
  document.getElementById("gross-title2").style.background = 'url(/images/trans-white.png) repeat';
	document.getElementById("gross-title3").style.background = 'url(/images/trans-white.png) repeat';
}
function doppelzimmer() {
	document.getElementById("grossbild-apartment").style.display = 'none';
	document.getElementById("grossbild-doppelzimmer").style.display = 'inline';
	document.getElementById("grossbild-einzelzimmer").style.display = 'none';
	document.getElementById("gross-title1").style.background = 'url(/images/trans-white.png) repeat';
  document.getElementById("gross-title2").style.background = 'url(/images/trans-blue.png) repeat';
	document.getElementById("gross-title3").style.background = 'url(/images/trans-white.png) repeat';
}
function einzelzimmer() {
	document.getElementById("grossbild-apartment").style.display = 'none';
	document.getElementById("grossbild-doppelzimmer").style.display = 'none';
	document.getElementById("grossbild-einzelzimmer").style.display = 'inline';
	document.getElementById("gross-title1").style.background = 'url(/images/trans-white.png) repeat';
  document.getElementById("gross-title2").style.background = 'url(/images/trans-white.png) repeat';
	document.getElementById("gross-title3").style.background = 'url(/images/trans-blue.png) repeat';
}