var xmlUtil = new XMLUtil();
    var http;

    function renderRandomTip()
    {
        http = xmlUtil.getXMLHTTPObject();
        http.open('GET', APP_DIRECTORY+'/tips/random/3', true);
        http.onreadystatechange = handleRandomTip;
        http.send(null);
    }

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