function changeToolbarForm(showForm) {
    switch(showForm) {
        case 'opinion':
            document.getElementById('form_enviar_amigo').style.display = "none";
            document.getElementById('form_comentario').style.display = "block";
            break;

        default:
            document.getElementById('form_enviar_amigo').style.display = "block";
            document.getElementById('form_comentario').style.display = "none";
            break;
    }
}