-->What I did was to search for the first record with an image in it and assumed that this was the cover if it exsisted.
thank you for the hint. When I look at MobipocketCreator generated PRC file created from a HTML page containing pictures (took this thread as an example), the first records after the html part contain pictures used within the HTML. The cover art I specified in Creator can actually be found in the last record. Hmm,maybe I have to actually wait for the reader to see what it picks up. Hope it does not take too long till it is available again.