function handleAjaxRequest(url, elementId, loadHTML, asynchronous) {
    
    var http = getHTTPObject();
    
    http.onreadystatechange = function () {
        if (http.readyState == 1) {
            if (loadHTML!='') {
                parent.document.getElementById(elementId).innerHTML = loadHTML;
            }
        } else if (http.readyState == 4) {
            parent.document.getElementById(elementId).innerHTML = http.responseText;
        }
    }
    http.open("GET", url, asynchronous);
    http.send(null);

} 

function getHTTPObject() {
    xmlhttp = false;
    
    if (window.XMLHttpRequest) { // Mozilla
        xmlhttp = new XMLHttpRequest();
        if (xmlhttp.overrideMimeType) {
            xmlhttp.overrideMimeType('text/xml');
        }
    } else if (window.ActiveXObject) { // IE
        try {
            xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
        } catch (e) {
            try {
                xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e) {}
        }
    }
    
    if (!xmlhttp) {
        alert('Kann keine XMLHTTP-Instanz erzeugen');
        return false;
    } else {
        return xmlhttp;
    }
}