function validateFields() {
	var themessage = "Let op: \n\n";
	if (document.emailform.email.value=="") {
		themessage = themessage + "-  Emailadres niet ingevuld \n";
	}
	if (themessage == "Let op: \n\n") {
		document.emailform.submit();
	}
	else {
		alert(themessage);
	return false;
   }
}