var xmlUtil = new XMLUtil();
    var http;

    function getTagCloud(orderBy, threshold)
    {
        http = xmlUtil.getXMLHTTPObject();
        http.open('GET', APP_DIRECTORY+'/tags/cloud/'+browseBy+'/'+orderBy+'/'+threshold+'/'+tags, true);
        http.onreadystatechange = handleTagCloud;
        http.send(null);
    }

    function handleTagCloud()
    {
        if ((http.readyState == xmlUtil.COMPLETE) && (http.status == 200))
        {
            replaceHTML('tag_cloud', http.responseText);
        }
    }