function switchImage(imgName) {
	if(document.getElementById('image')) document.getElementById('image').style.display = 'block';
	if(document.getElementById('vrij_intro')) document.getElementById('vrij_intro').style.display = 'none';
	
	
	document.images["display"].src = "foto/" + imgName;
}

function showIntro(introId){
	document.getElementById('image').style.display = 'none';
	document.getElementById(introId).style.display = 'block';
}