function SwitchRadioState(radiobtn) {
	
	SetError("");

	selectedbtn = radiobtn;
	if(selectedbtn.checked) {
		var timing = 250;
		setTimeout("selectedbtn.checked = false", timing);
	}
	
	return false;
}

function CheckAnswer() {
	var result = false;
	
	for (i=0; i<document.forms[0].answer.length; i++) {
		if (document.forms[0].answer[i].checked)
			result = true;
	}
	
	if(!result)
		SetError("Gelieve een antwoord te kiezen.");
	
	return result;
}

function SetError(msg) {
	var error_msg = document.getElementById("errormsg");
	error_msg.innerHTML = msg;
}