function XMLHttpMunicipios() {
	
	var xmlhttp=false;
	
 	try	{
 		xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
 	} catch (e) { try {
 			xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
 		} catch (E) {
 			xmlhttp = false;
 		}
  	}

	if (!xmlhttp && typeof XMLHttpRequest!='undefined') {
 		xmlhttp = new XMLHttpRequest();
	}
	
	return xmlhttp;
	
}

function ListMunicipios() {

	var contenedor, id, request;
	contenedor = document.getElementById('zone_httpxmlmunicipios');
	id = document.getElementById('provincia').value;
	
	if(id != 0) {
	
		request = XMLHttpMunicipios();
		
		request.open("GET", '/inst_http_municipios.php?provincia=' + id,true);
		request.onreadystatechange=function() {
			if(request.readyState==1) {
				document.getElementById('zone_httpxmlmunicipios').innerHTML = '<div><img src="img/loading.gif" border="0"></div>';
			} else if(request.readyState==4) {
				contenedor.innerHTML = request.responseText
			}
		}
		request.send(null)
	}
	
}