function displaySubMenu(li) {
    var subMenu = li.getElementsByTagName("ul")[0];
    subMenu.style.display = "block";
}
function hideSubMenu(li) {
    var subMenu = li.getElementsByTagName("ul")[0];
    subMenu.style.display = "none";
}

function addBookmark(title, url) {
    if (window.sidebar) {
        window.sidebar.addPanel(title, url, "");
    } else if (document.all) {
        window.external.AddFavorite(url, title);
    } else if (window.opera && window.print) {
        return true;
    }
}