function fadeIn(id, alpha) {
    var obj = document.getElementById(id);
    alpha = alpha + 20;
    obj.style.filter = "alpha(opacity=" + alpha + ")";
    obj.style.opacity = alpha / 100;
    obj.style.visibility = 'visible';
    obj.style.display = 'block';
    if (alpha < 100) {
        window.setTimeout("fadeIn('" + id + "'," + alpha + ");", 50);
    }
}
function fadeOut(id, alpha) {
    var obj = document.getElementById(id);
    alpha = alpha - 20;
    obj.style.filter = "alpha(opacity=" + alpha + ")";
    obj.style.opacity = alpha / 100;
    if (alpha > 0) {
        window.setTimeout("fadeOut('" + id + "'," + alpha + ");", 50);
    }
    else {
        obj.style.visibility = 'hidden';
        obj.style.display = 'none';
    }
}