<!--
// ------------------------------------------------
// Script : Form Validation Script
// Language : JavaScript 1.1
// Made by : Harm van den Hoven
// Modified by : Niels Laan
// ------------------------------------------------

function isInput(veld) {
	if (veld == null || veld == "" || veld == veld.defaultValue) {
		return false;
	}
	return true;
}

function isEmail(veld) {
	checkemail = false;
	email = veld;
	apos = email.indexOf('@');
	
	if(!isInput(veld) == false) {
		if (apos > 1 && (email.lastIndexOf('.') > apos + 1)) checkemail = true;
		if (email.indexOf('@',apos + 1) > apos)  checkemail = false;
	}
	else {
		return true;
	}
	
	return checkemail;
}	

function CheckForm(f) {

	msg = "";
	//f = document.form

	if (!isInput(f.Achternaam.value)) msg += "Je moet je achternaam nog invullen\n";
  	if (!isInput(f.EMAIL.value)) msg += "Uw e-mail is niet goed ingevuld.\n";
	if (!isInput(f.COMMENTS.value)) msg += "Wel een berichtje invullen hoor.\n";

	if(msg == "") return true;
	else {
		alert(msg);
		return false;
	}
}

// -->