function facebook() {
    f = 'http://www.facebook.com/sharer.php?u=' + encodeURIComponent(window.location.href) + '&t=' + encodeURIComponent(document.title);
    a = function() {
        if (!window.open(f, 'facebook', 'location=yes,links=no,scrollbars=no,toolbar=no,width=800,height=550'))
            location.href = f + 'jump=yes'
    };
    if (/Firefox/.test(navigator.userAgent)) {
        setTimeout(a, 0)
    } else {
        a();
    }
}
function twitter() {
    f = 'http://twitter.com/home?status=Visitando o ' + encodeURIComponent(document.title) + ' ' + encodeURIComponent(window.location.href);
    a = function() {
        if (!window.open(f, 'twitter', 'location=yes,links=no,scrollbars=no,toolbar=no,width=855,height=550'))
            location.href = f
    };
    if (/Firefox/.test(navigator.userAgent)) {
        setTimeout(a, 0)
    } else {
        a();
    }
}

function favorite() {
    if (navigator.appName.indexOf('Internet Explorer') > 0) // IE
        window.external.AddFavorite(location.href, document.title);
    else
        window.sidebar.addPanel(document.title, location.href, "");
}

function orkut() {
    d = document;
    l = d.location;
    e = encodeURIComponent;
    u = 'http://promote.orkut.com/preview?src=bkmrklt&v=1&nt=orkut.com&du=' + e(l.href) + '&tt=' + e(d.title);
    s = '&rdrinl=1';
    
    if(!window.open(u,'','height=575,width=700,directories=0,location=1,menubar=0,resizable=0,scrollbars=1,status=1,toolbar=0'))l.href=u+s;
}