function abrir(){
document.getElementById('opaco').style.display = 'block';
}


function sair(){
document.getElementById('opaco').style.display = 'none';
}


function tempo(){
document.getElementById('email_enviado').style.display = 'block';
setTimeout ("fechar_aviso()", 3000);

}


function fechar_aviso(){
document.getElementById('email_enviado').style.display = 'none';
}