$.ajax and $.getJSON in not working in mozilla

$.ajax and $.getJSON in not working in mozilla


hi
I'm using $.getJSON to get data from WCF service in the form om
json. this is working fine in IE7 but in mozilla it returns nothing.
My code is
$.getJSON("http://localhost:3162/VirtualService/Settings.svc/
GetAllCountries",
function(data) {
alert(data);
});
this code returning me the list of countries in json format.
so what to do in the case of mozilla..
regards
dsingh