function arah(url, target, msg) {

    document.getElementById(target).innerHTML = msg;

    // native XMLHttpRequest object    
    if (window.XMLHttpRequest) {
        req = new XMLHttpRequest();
        req.onreadystatechange = function() {arahDone(target);};
        req.open("GET", url, true);
        req.send(null);

    // IE/Windows ActiveX version    
    } else if (window.ActiveXObject) {

        req = new ActiveXObject("Microsoft.XMLHTTP");

        if (req) {
            req.onreadystatechange = function() {arahDone(target);};
            req.open("GET", url, true);
            req.send();
        }
    }
}


function arahDone(target) {

    // only if req is "loaded"
    if (req.readyState == 4) {

        // only if "OK"
        if (req.status == 200) {
            results = req.responseText;
            document.getElementById(target).innerHTML = results;
        } else {
            document.getElementById(target).innerHTML = "<span style=\"color:#ff0000\">Problemas! (" + req.statusText + ").</span><br />Contacte o administrador!";
        }
    }
}