// server-side script
var url = "lib/ajax/getCat.php?id=";

function handleHttpResponse() {   
	if (http.readyState == 4) {
		if(http.status == 200) {
			var results = http.responseText;
			document.getElementById('divCatDropdown').innerHTML = results;
		}
	}
}     
function requestCatInfo() {     
	var sId = document.getElementById('groepid').value;
	http.open("GET", url + escape(sId), true);
	http.onreadystatechange = handleHttpResponse;
	http.send(null);
}
function getHTTPObject() {
	var xmlhttp;

if(window.XMLHttpRequest) {
		xmlhttp = new XMLHttpRequest();
	}
	else if (window.ActiveXObject) {
		xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
		if (!xmlhttp) {
			xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
		}
	}
	return xmlhttp;
}
// maak HTTP Object
var http = getHTTPObject();