Aha!  I see, now.

The background image function does seem to work offline, for me.  Possibly that depends on what you're using to run the .swf?    I'm using SWF Opener.

http://www.browsertools.net/SWF-Opener/index.html

The only trouble I'm having is that I have to completely close and re-load everything in order to get rid of a background image.

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.