subject_id = '';

function createRequestObject() {
		var request_object;
		var browser = navigator.appName;
		if(browser == "Microsoft Internet Explorer") {
			request_object = new ActiveXObject("Microsoft.XMLHTTP");
		} else {
			request_object = new XMLHttpRequest();
		}
		return request_object;
}

var http = createRequestObject();

function check_domein(div_id)
{
	subject_id = div_id;
	var domein = document.hostingformulier.domein.value;
	var ext = document.hostingformulier.ext.value;
	http.open('get', 'http://www.maiden-voyage.nl/domain_check.php?domain=' + domein + '&ext=' + ext);
	http.onreadystatechange = handleHttpResponse;
	http.send(null);
}

function handleHttpResponse() {
	if(http.readyState == 4) {
		var response = http.responseText;
		if (subject_id != '') {
			document.getElementById(subject_id).innerHTML = response;
		}
	}
}