function setUserInfoPos() {
    var x = window.innerWidth;
    var ui;

    x = x - 18;    // maybe scroll bar

    ui = document.getElementById('userinfo');
    if (ui != null) {
        ui.style.right = "3px";
//        document.getElementById('userinfo').style.bottom = "3px";
        ui.style.bottom = 3 - window.pageYOffset + "px";
    }
}

window.onload = setUserInfoPos;
window.onresize = setUserInfoPos;
window.onscroll = setUserInfoPos;