function mailingOK () {
	try {
		var allOK = true;
		
		// check sex
		if (!document.getElementById('geslacht_m').checked && !document.getElementById('geslacht_f').checked) {
			document.getElementById('geslachtSpan').style.color = 'orange';
			allOK = false;
		} else {
			document.getElementById('geslachtSpan').style.color = 'white';
			allOK = true;
		}
		
		// check last name
		if (document.getElementById('achternaam').value == '') {
			document.getElementById('achternaamSpan').style.color = 'orange';
			allOK = false;
		} else {
			document.getElementById('achternaamSpan').style.color = 'white';
			allOK = true;
			
		}
		
		// check email
		var field = document.getElementById('email'); // email field
		var str = field.value; // email string
		var reg2 = /^.+\@(\[?)[a-zA-Z0-9\-\.]+\.([a-zA-Z]{2,3}|[0-9]{1,3})(\]?)$/; // valid
		if (!reg2.test(str)) {
			document.getElementById('emailSpan').style.color = 'orange';
			allOK = false;
		} else {
			document.getElementById('emailSpan').style.color = 'white';
			allOK = true;
		}

		return allOK;
	} catch (e) {
			alert(e.toString());
			return false;
	}
}