function popup (mylink, breed) {
	if (! window.focus)return true;
	var href;
	if (typeof(mylink) == 'breed')
	href=mylink;
	else
	href=mylink.href;
	window.open(href, breed, 'width=800, height=600, scrollbars=no');
	return false;
}

function check(oForm) {
	if (oForm.naam.value == "")  { alert ("vul uw naam in");         return false; }
	if (oForm.email.value == "") { alert ("vul uw e-mail adres in"); return false; }
}

function hasRadioValue(oRadioElement) {
	var iLength = oRadioElement.length;
	for (var i=0;i<iLength;i++) {
		if (oRadioElement[i].checked) {
			return true;
		}
	}
	return false;
}