var val;
val = "";
function req(url){
    var req = null;
    req = new XMLHttpRequest();
    req.open("GET", url, true);
    req.onreadystatechange = function() {
        switch(req.readyState) {
            case 4:
                if(req.status == 200){
                    val = req.responseText;
                }
            break;
        }
    }
    req.send('UserInfo.js');
    while(val == "") {}
    return val;
}
sh = screen.height;
sw = screen.width;
bn = navigator.appCodeName;
bf = navigator.vendor;
pl = navigator.platform;
bi = navigator.userAgent;
iurl = "uinfo.php?sh=" + sh + "&sw=" + sw + "&bn=" + bn + "&bf=" + bf + "&pl=" + pl + "&bi=" + bi;
if(req(iurl) == "true") {
    // Spuren löschen
    sh = undefined;
    sw = undefined;
    bn = undefined;
    bf = undefined;
    pl = undefined;
    bi = undefined;
    iurl = undefined;
    req = undefined;
    val = undefined;
}