Page stay loading and disabled

Page stay loading and disabled

I have not used Jquery until now y i like to know if some one can help with some issue:

The point is that i like to refresh the full page content when the value of a list changes.

The code was embeded insise a codeigniter app:

The list box is as follow: 

<div id="id_municipio">
 <select name="co_municipio" id="ix_municipio">  <option value="">Seleccione un municipio</option>  </select>
</div> 
The event used to control id_municipio changes is:

<script type="text/javascript">
$(document).ready(function () {
$('#id_municipio').change(function () {
var $co_estado = null; 
var $co_municipio = null; 
$co_estado = $("#id_estado").val(); 
$co_municipio= $("#ix_municipio").val();  
abrirPagDinamica('recomendaciones?co_estado='+$co_estado+'&co_municipio='+$co_municipio,'inicio','post');
});
});
</script>

The procedure  abrirPagDinamica is a js function that invokes a code igniter controller and place the result inside the id (second parameter div). 

function abrirPagDinamica(pagina, div, tipoenvio)
{
var division = pagina.split("?");
var parametros = "";

if(division.length == 2)
{
pagina = division[0];
parametros = division[1];
}

//alert(parametros);

if(tipoenvio.toLowerCase() == "post")
{
$.post(pagina,parametros,
function(rt){ 
$("#"+div).html(rt);
}, "text");
}else if(tipoenvio.toLowerCase() == "get")
{
$.get(pagina,parametros,
function(rt){ 
$("#"+div).html(rt); 
}, "text");
}
}

The final result is that everything is ok: The page is updated correctly but stay with the message "loading...." and disabled.

If this info is enought and some one can help, I will thanks

Campo