function PostBusca(F, Field, e)
{
    var keycode;
    if (window.event) keycode = window.event.keyCode;
    else if (e) keycode = e.which;
    else return true;
    if (keycode == 13) {
        //myfield.form.submit();
        window.location.href = '/busca/' + F.busca.value;
        return false;
    }
    else
        return true;
}