function seleccionar_zona(id_zona)
{
	if(id_zona=='null') return;
	var imgLoad = d('select_cargando');
	imgLoad.src = 'http://www.anunciosdiarios.com/4619145686913/img/loading.gif';
	var ajaxXML = getXMLHTTPRequest();
	ajaxXML.open("GET", URL_BASE+'zonaAjax/listado_zonas.php?id_zona='+id_zona+'&ajax=1' , true);
	ajaxXML.onreadystatechange = function ()
	{
		if (ajaxXML.readyState == 4)
		{
			if (ajaxXML.status == 200)
			{
				d('select_zonas').innerHTML = ajaxXML.responseText;
				imgLoad.src = 'http://www.anunciosdiarios.com/4619145686913/img/spacer.gif';
			}
		}
	};
	ajaxXML.send(null);
}