function showStressTest() {
	var test = document.getElementById('stresstest');
	var result = document.getElementById('stressergebnis');

	result.style.display = 'none';
	test.style.display = 'block';
}

function showStressResult() {
	var test = document.getElementById('stresstest');
	var result = document.getElementById('stressergebnis');
	var points = document.getElementById('stresspunkte');
	var form = document.forms.stress;
	
	var p = 0;
	for (var i = 0, el; el = form.elements[i]; i++) {
		if (el.type == 'radio' && el.checked)
			p += parseInt(el.value);
	}
	
	points.innerHTML = p;
	test.style.display = 'none';
	result.style.display = 'block';
}