jQuery and Google Maps json response

I am having troubles getting geo location info from google maps api

the code is pretty straight forward

$.ajax({
    type: "GET",
    cache: false,
    url: "http://maps.googleapis.com/maps/api/geocode/json",
    dataType: "jsonp",
    data: {
        address: "Ljubljana " + "Slovenia",
        sensor: "false"
    },
    jsonpCallback:'json_response',
    success: function(data) {
        top.console.debug(data);
        $('#location_setter').dialog('close');
    },
    error: function() {
        alert("Error.");
    }
});


function json_response(data){
    alert("works");
}

I always get an error back. I tried directly too (I read somewhere that the callback should be set at the end...

$.ajax({
    type: "GET",
    cache: true,
    url: "http://maps.googleapis.com/maps/api/geocode/json?address=Ljubljana Slovenia&sensor=false",
    dataType: "jsonp",
    jsonpCallback:'json_response',
    success: function(data) {
        top.console.debug(data);
        $('#location_setter').dialog('close');
    },
    error: function() {
        alert("Error.");
    }
});

the request url is correctly formed:

http://maps.googleapis.com/maps/api/geocode/json?address=Ljubljana%20Slovenia&sensor=false&callback=json_response

and it gives me the correct json

please advise!

You can 'play' with it at http://jsfiddle.net/PNad9/