anchor.diff:  
                       <div class="col-md-4">
                           <label>Arl:</label> 
  -                        <%= f.collection_select :arl_id, Arl.all, :id, :nombre, {prompt: "Selecciones una Arl"}, {class: "form-control arl habilitado"} %>
  +                        <%= f.collection_select :arl_id, Arl.all, :id, :nombre, {prompt: "Selecciones una Arl"}, {class: "form-control arl habilitado", id: "textbox", :disabled => true} %>
                       </div>
   
   
  
negative.code: 
            <div class="col-md-4">
                <label>Condición:</label> 
                <%= f.select :a_condicion, [ 'Pasajero', 'Tripulante', 'Empleado', 'Visitante', 'Otro' ], {prompt: "Campo Obligatorio"},  {class: "form-control", id: "combo"} %>
  
            </div>
   <tr valign="baseline">
   <td nowrap="nowrap" align="right" class="postage">Postage:</td>
   <input type="text" name="postage" id="textbox" disabled>
  
  
  
  