function changeMenuAtivo(id) {

    document.getElementById("menuEmpresa").className = '';
    document.getElementById("menuCadastro").className = '';
    document.getElementById("menuComprar").className = '';
    document.getElementById("menuRevendas").className = '';
    //document.getElementById("menuAcessoVip").className = '';
    //document.getElementById("menuVideos").className = '';
    document.getElementById("menuFaleConosco").className = '';

    document.getElementById("menu" + id).className = 'ativo';
}