var xmlHttpObject = false;

if (typeof XMLHttpRequest != 'undefined') {
    xmlHttpObject = new XMLHttpRequest();
}

if (!xmlHttpObject) {
    try {
        xmlHttpObject = new ActiveXObject("Msxml2.XMLHTTP");
    } catch(e) {
        try {
            xmlHttpObject = new ActiveXObject("Microsoft.XMLHTTP");
        } catch(e) {
            xmlHttpObject = null;
        }
    }
}


function refresh_online_pointer()
{
    xmlHttpObject.open('get','/besucherzaehler_ajax.php');
    xmlHttpObject.send(null);
}

window.setInterval("refresh_online_pointer()", (290 * 1000));