var mnuSelected = '';
function showMenu(menu) {
    hideMenu(mnuSelected);
    document.getElementById(menu).style.display = '';
    mnuSelected = menu;
}
function hideMenu(menu) {
    if (mnuSelected != '')
        document.getElementById(menu).style.display = 'none';
}

function bookmark(a) {
    title = document.title;
    url = document.location;
    try {
        // Internet Explorer
        window.external.AddFavorite(url, title);
    }
    catch (e) {
        try {
            // Mozilla
            window.sidebar.addPanel(title, url, "");
        }
        catch (e) {
            // Opera
            if (typeof (opera) == "object") {
                a.rel = "sidebar";
                a.title = title;
                a.url = url;
                return true;
            }
            else {
                // Unknown
                alert('Press Ctrl-D to add page in bookmarks');
            }
        }
    }
    return false;
}