var val_ = 0;
var del = -4;
var object = "";
var delay = 20;
var objFade = null;

function change_opacity(value) {
    var object = objFade.style;
    object.opacity = (value / 100);
    object.MozOpacity = (value / 100);
    object.KhtmlOpacity = (value / 100);
    object.filter = 'alpha(opacity=' + value * 100 + ')';
}

function StartFade(object_, delay_) {
    object = object_;
    delay = delay_;
    objFade = document.getElementById(object);
    fade(100);
}

function fade_opacity(val) {
    val_ = val;
    change_opacity(val_);
    val_ += del;
    if (val_ <= 0 || val_ > 100) del *= -1;
    setTimeout('fade_opacity(val_)', delay);
}