function show_layer(namn) {
	if (document.getElementById('about'))
	document.getElementById('about').style.visibility = "hidden";
	if (document.getElementById('education'))
	document.getElementById('education').style.visibility = "hidden";
	if (document.getElementById('solo_exhibitions'))
	document.getElementById('solo_exhibitions').style.visibility = "hidden";
	if (document.getElementById('group_exhibitions'))
	document.getElementById('group_exhibitions').style.visibility = "hidden";
	if (document.getElementById('by'))
	document.getElementById('by').style.visibility = "hidden";

	document.getElementById(namn).style.visibility = "visible";
}