function getNAW() {
	var pc = document.getElementById('postal_code').value;
	var number = document.getElementById('huisnr').value;
	
	pc = pc.replace(/ /g, '');
	
	if (pc != "" && number != "") {
		GETRequest(pc, number);
	} 
	else {
		document.getElementById('city').value = '';
	}
}

function createXMLHttpRequest() {
	if (window.ActiveXObject) {
		xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
	} 
	else if (window.XMLHttpRequest) {
		xmlHttp = new XMLHttpRequest();
	}
}

function GETRequest(postcode, huisnr) {
	createXMLHttpRequest();
	
	var queryString = "js/checknaw.php?pc=" + postcode + "&nr=" + huisnr;
	
	xmlHttp.onreadystatechange = handleStateChange;
	xmlHttp.open("GET", queryString, true);
	xmlHttp.send(null);
}

function handleStateChange() {
	if(xmlHttp.readyState == 4) {
		if(xmlHttp.status == 200) {
			parseResults();
		}
	}
}

function parseResults() {
	var returnText = xmlHttp.responseText;
	
	broken = returnText.split('||');
	
	document.getElementById('city').value = broken[1];
}