function toggleLayer1() {
document.getElementById("map1").style.display = "none";
document.getElementById("map2").style.display = "block";
}
function toggleLayer2() {
document.getElementById("map1").style.display = "block";
document.getElementById("map2").style.display = "none";
}
function toggleHeader1() {
document.getElementById("headerimg1").style.display = "none";
document.getElementById("headerimg2").style.display = "block";
}
function toggleHeader2() {
document.getElementById("headerimg1").style.display = "block";
document.getElementById("headerimg2").style.display = "none";
}
function toggleTab1() {
	document.getElementById("apartament").style.display = "none";
	document.getElementById("project").style.display = "block";
		document.getElementById("tab2").className ="bla";
		document.getElementById("tab1").className ="selected";
}
function toggleTab2() {
	document.getElementById("apartament").style.display = "block";
	document.getElementById("project").style.display = "none";
		document.getElementById("tab1").className ="bla";
		document.getElementById("tab2").className ="selected";
}