function chkNieuwsbriefForm(){
	var oFrm = document.nieuwsbriefForm;

	document.getElementById('typeerror').style.color = '555555';
	document.getElementById('mailerror').style.color = '555555';

	if (oFrm.mail.value == ''){
		document.getElementById('mailerror').style.color = 'ff0000';
		oFrm.mail.focus();
		return false;
	}

	if ((!oFrm.textMail.checked) && (!oFrm.htmlMail.checked)){
		document.getElementById('typeerror').style.color = 'ff0000';
		return false;
	}

	oFrm.action='?nieuwsbrief.html=m&MOD=NIEUWSBRIEF&p=NIEUWSBRIEFINVULFORMULIERPOST';
	oFrm.submit();
}