I need to do a cross-domain request in a chrome extension. I know I can it via message passing but I'd rather stick to just jQuery idioms (so my javascript can also work as a <script src="">).

I do the normal:

$.getJSON("http://api.flickr.com/services/feeds/photos_public.gne?tags=cat&tagmode=any&format=json&jsoncallback=?", callback(function(data) {
  alert(data);
});

but in the error console I see:

Uncaught ReferenceError: jsonp1271044791817 is not defined

Is jQuery not inserting the callback function correctly into the document? What can I do to make this work?