var Services = {
  Flickr: {
    getPhotosFor: function(user_id, passedFunction) {
      $.getJSON("http://api.flickr.com/services/feeds/photos_public.gne?id="+user_id+"&format=json&jsoncallback=?", function(data){ 
        var photos = [];
        $.each(data.items.slice(0,18), function(i, item) { 
          var photo = {
            link: item.link,
            img_urls: {
              square: item.media.m.replace(/_m.jpg$/, "_s.jpg"),
              thumb: item.media.m.replace(/_m.jpg$/, "_t.jpg"),
              small: item.media.m,
              medium: item.media.m.replace(/_m.jpg$/, ".jpg")
            },
            title: item.title
          }
          photos.push(photo);
        });
        passedFunction(photos);
      });
      return true;
    }
  }
};