Thanks for JS header image rotating

Is there a way to make it pick a random starter image when you load a page and then transition to another random image after the time is up, instead of the next one in the folder alphabetically?

Once I get that figured out I figure I'll re-implement the smooth image transition shown in this forum already although I think that's a great feature to be included in the theme itself down the road, perhaps.

edit: ack and with the slideshow disabled it doesn't work around the caching!