function checkForm(form){
	var msg ="";

	if(form.fnaam.value == ''){
	msg += ('* Naam\n');
	document.getElementById('sternaam').style.color = 'red';
	}
	else {document.getElementById('sternaam').style.color = '';}
	
	
	if(form.femail.value.indexOf('@') == -1) {
	msg += ('* E-mail\n');
	document.getElementById('steremail').style.color = 'red';
	}
	else {document.getElementById('steremail').style.color = '';}


	if(form.fcommentaar.value == ''){
	msg += ('* Bericht\n');
	document.getElementById('stercommentaar').style.color = 'red';
	}
	else {document.getElementById('stercommentaar').style.color = '';}
	

	if (!msg == "") {
	window.alert("Volgende (verplichte) velden zijn niet (correct) ingevuld:\n" + "\n" + msg + "\n" + "Gelieve deze velden (correct) in te vullen.");
	event.returnValue = false;
	}
}

function checkKalenderForm(form) {
	var msg ="";

	if(form.frmdag.value == ''){
	msg += ('* Dag\n');
	document.getElementById('sterdag').style.color = 'red';
	}
	else {document.getElementById('sterdag').style.color = '';}
	
	

	if(form.frmmaand.value == ''){
	msg += ('* Maand\n');
	document.getElementById('stermaand').style.color = 'red';
	}
	else {document.getElementById('stermaand').style.color = '';}
	
	
	if(form.frmjaar.value == ''){
	msg += ('* Jaar\n');
	document.getElementById('sterjaar').style.color = 'red';
	}
	else {document.getElementById('sterjaar').style.color = '';}
	
	if(form.frmtitel.value == '') {
	msg += ('* Titel\n');
	document.getElementById('stertitel').style.color = 'red';
	}
	else {document.getElementById('stertitel').style.color = '';}


	if(form.frminformatie.value == ''){
	msg += ('* Informatie\n');
	document.getElementById('sterinformatie').style.color = 'red';
	}
	else {document.getElementById('sterinformatie').style.color = '';}
	

	if (!msg == "") {
	window.alert("Volgende (verplichte) velden zijn niet (correct) ingevuld:\n" + "\n" + msg + "\n" + "Gelieve deze velden (correct) in te vullen.");
	event.returnValue = false;
	}
}

function checkKalenderVanTotForm(form) {
	var msg = "";
	
	if(form.frmvandag.value == '' || form.frmvanmaand.value == '' || form.frmvanjaar.value == ''){
	msg += ('* Van\n');
	document.getElementById('stervandag').style.color = 'red';
	}
	else {document.getElementById('stervandag').style.color = '';}


	if(form.frmtotdag.value == '' || form.frmtotmaand.value == '' || form.frmtotjaar.value == ''){
	msg += ('* Tot\n');
	document.getElementById('stertotdag').style.color = 'red';
	}
	else {document.getElementById('stertotdag').style.color = '';}
	
	
	if(form.frmtitel.value == '') {
	msg += ('* Titel\n');
	document.getElementById('stertitel').style.color = 'red';
	}
	else {document.getElementById('stertitel').style.color = '';}


	if(form.frminformatie.value == ''){
	msg += ('* Informatie\n');
	document.getElementById('sterinformatie').style.color = 'red';
	}
	else {document.getElementById('sterinformatie').style.color = '';}
	

	if (!msg == "") {
	window.alert("Volgende (verplichte) velden zijn niet (correct) ingevuld:\n" + "\n" + msg + "\n" + "Gelieve deze velden (correct) in te vullen.");
	event.returnValue = false;
	}
}