code: public ImageContainer get(String requestUrl, final ImageListener listener, final Object tag) {
          return get(requestUrl, listener, 0, 0, tag);
      }
docs: Returns an ImageContainer for the requested URL.
  
  The ImageContainer will contain either the specified default bitmap or the loaded bitmap.
  If the default was returned, the {@link ImageLoader} will be invoked when the
  request is fulfilled.
  
  @param requestUrl The URL of the image to be loaded.