Partially loading an external SWF (frame by frame?)

I have an application swf that loads a big external swf with all GUI components/assets (skin) in it.

I want to display a progress bar during loading of the external asset swf file but the images for the progress bar are also included in the external swf file.

Is it possible to load only a portion of the external swf before loading the rest. The idea is to load the progress bar images from the external swf, then construct the progress bar and than load the rest of the swf.

I was thinking to put it on different frames. Frame 1 containing the progress bar graphics and frame 2 the rest of the assets.

Any thoughts/solutions?

[btw. putting the progress bar images in the main swf is not an option/solution]