function nav (url, target, width, height) {
	if (target == "huidig")
		location.href = url;
	else if (target == "nieuw")
		window.open (url);
	else if (target == "popup")
		openPopup (url, "popup", width, height, 1);
	
	return false;
}

function openPopup (url, name, w, h, resizable) {
	var resizable = resizable || 0;
	var opt = "toolbar=0,location=0,scrollbars="+resizable+",directories=0,status=0,menubar=0,resizable="+resizable+","
				+"width="+w+",height="+h+",left="+parseInt((screen.width-w)/2)+",top="+parseInt((screen.height-h)/3);
	window.open(url, name, opt);
}

function checkVereniging () {
	var vereniging = document.getElementById("vereniging").value;
	if (vereniging == 'nee') {
		document.getElementById("verenigingsnaam_verplicht_td1").style.display = "none";
		document.getElementById("verenigingsnaam_verplicht_td2").style.display = "none";
		document.getElementById("verenigingsplaats_verplicht_td1").style.display = "none";	
		document.getElementById("verenigingsplaats_verplicht_td2").style.display = "none";	
	} else {
		document.getElementById("verenigingsnaam_verplicht_td1").style.display = "table-cell";
		document.getElementById("verenigingsnaam_verplicht_td2").style.display = "table-cell";
		document.getElementById("verenigingsplaats_verplicht_td1").style.display = "table-cell";	
		document.getElementById("verenigingsplaats_verplicht_td2").style.display = "table-cell";	
	}
}