function expand_classificatie (id) {
	var style_obj = document.getElementById('classificatie'+id).style;
	var style_obj2 = document.getElementById('toelichting'+id).style;
	var current_style=style_obj.display;
	var current = true;
	if (current_style == 'none') {
		current = false;
	}

	if (current) {
		t = 'tulp';
		if (id != 1)
			t = t+'en';
		document.getElementById('classificatie'+id+'_link').innerHTML = 'Bekijk de normen voor '+id+' '+t;
		style_obj.display = 'none';
		style_obj2.display = 'none';
	} else {
		document.getElementById('classificatie'+id+'_link').innerHTML = 'Verberg onderstaande normenlijst';
		style_obj.display = 'block';
		style_obj2.display = 'block';
	}

	for (i=1; i<=5; i++) {
		if (i!=id) {
			var style_obj = document.getElementById('classificatie'+i).style;
			style_obj.display = 'none';
			var style_obj2 = document.getElementById('classificatie'+i).style;
			style_obj2.display = 'none';
		}
	}
}