Json callback problem

Question

I'm trying to get a greasemonkey's script to work jquery and json. this is the json url http://www.sora101.net/auction.php?id=1&callback=

this is part of the script

$.getJSON("http://sora101.net/auction.php?id=1&callback=?",
                    function(data){
                        alert(data.id);
                    }
                    );

i always get something like this "Error: jsonp1282646809490 is not defined" in the console.

i also found this h**p://www.xucia.com/CrossSafe/test.html on this site i get the right object returned but when i include this in my script it doesn't work...

can anyone help me? thanks and sorry for bad english