function textCounter(field,maxlimit,id_car_restantes) {
    if (field.value.length > maxlimit) { // if too long...trim it!
        field.value = field.value.substring(0, maxlimit);
    // otherwise, update 'characters left' counter
    }else {
        new_value = maxlimit - field.value.length;
        //cntfield.value = new_value;
        stringa = document.getElementById(id_car_restantes);
        stringa.innerHTML = '('+te_quedan+' '+new_value+' '+caracteres+')';
    }
}