function maximoCaracteres(element, qtd){
    var valor = element.value;
    valor = valor+"";
    if(valor.length > 1000){
        document.getElementById('mensagem').value = valor.substr(0,1000);
        valor = valor.substr(0,1000);
    }
    document.getElementById('formDica').innerHTML = 'Caracteres restantes: '+(1000-valor.length);
}