function pularCampo(fields) {
 if (fields.value.length == fields.maxLength) {
  for (var i = 0; i < fields.form.length; i++) {
   if (fields.form[i] == fields && fields.form[(i + 1)] && fields.form[(i + 1)].type != "hidden") {
        fields.form[(i + 1)].focus();
        break;
   }
  }
 }
}