//código em http://labnol.blogspot.com/2006/01/add-to-favorites-ie-bookmark-firefox.html
function AddBookmark() 
{
    title = "Dicionários-Online.com";
    url = "http://www.dicionarios-online.com/";

    if (window.sidebar) { // Mozilla Firefox Bookmark
        window.sidebar.addPanel(title, url, "");
    } else if (window.external) { // IE Favorite
        window.external.AddFavorite(url, title);
    }
    else if (window.opera && window.print) { // Opera Hotlist
        return true;
    }
}