function controle() {
	var taal = document.getElementById('taal').value;
	var a = document.getElementById('velden').value;
	var arr = a.split(',');
	for (var x = 0; x < arr.length; x++) {
		var b = arr[x].split('|');
		if (document.getElementById(b[0]).value == '') {
			if (taal < 2) {
				melding  = 'Het veld ' + b[1] + ' is verplicht.';		
			} else if (taal == 2) {
				melding  = 'Field ' + b[1] + ' is compulsory.';	
			} else {
				melding  = 'Das feld ' + b[1] + ' ist obligatorisch.';
			}
			alert(melding);
			document.getElementById(b[0]).focus();
			return false;
		}
		if (b[0] == 'email') {
			if (emailControle(b[0]) == false) {
				if (taal < 2) {
					melding  = 'Het veld ' + b[1] + ' is ongeldig.';		
				} else if (taal == 2) {
					melding  = 'Field ' + b[1] + ' is invalid.';	
				} else {
					melding  = 'Das feld ' + b[1] + ' ist nicht gueltig.';
				}
				alert(melding);
				document.getElementById(b[0]).focus();
				return false;
			}	
		}
	}
	return true;
}

function emailControle(veld) {
	var emailStr = document.getElementById(veld).value;
	var checkTLD = 1;
	var knownDomsPat = /^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$/;
	var emailPat = /^(.+)@(.+)$/;
	var specialChars = "\\(\\)><@,;:\\\\\\\"\\.\\[\\]";
	var validChars = "\[^\\s" + specialChars + "\]";
	var quotedUser = "(\"[^\"]*\")";
	var ipDomainPat = /^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;
	var atom=validChars + '+';
	var word = "(" + atom + "|" + quotedUser + ")";
	var userPat = new RegExp("^" + word + "(\\." + word + ")*$");
	var domainPat = new RegExp("^" + atom + "(\\." + atom +")*$");
	var matchArray = emailStr.match(emailPat);
	if (matchArray == null) {
		return false;
	}
	var user = matchArray[1];
	var domain = matchArray[2];
	for (i = 0; i < user.length; i++) {
		if (user.charCodeAt(i) > 127) {
			return false;
		}
	}
	for (i = 0; i < domain.length; i++) {
		if (domain.charCodeAt(i) > 127) {
			return false;
		}
	}
	if (user.match(userPat) == null) {
		return false;
	}
	var IPArray = domain.match(ipDomainPat);
	if (IPArray != null) {
		for (var i = 1; i <= 4; i++) {
			if (IPArray[i] > 255) {
				return false;
			}
		}
		return true;
	}
	var atomPat = new RegExp("^" + atom + "$");
	var domArr = domain.split(".");
	var len = domArr.length;
	for (i = 0; i < len; i++) {
		if (domArr[i].search(atomPat) == -1) {
			return false;
		}
	}
	if (checkTLD && domArr[domArr.length-1].length!=2 && domArr[domArr.length-1].search(knownDomsPat)==-1) {
		return false;
	}
	if (len < 2) {
		return false;
	}
	return true;
}