function closeDiv(id) {
    if (document.getElementById) {
        var obj = document.getElementById(id);
        if (obj.style) {
            selectedObj = obj.style;
            selectedObj.display = "none";
            selectedObj = null;
            return false;
        }
    } else if (document.layers) {
        document.layers[id].visibility = "hide";
        return false;
    }
}