features:
	uses html frames, so that one need not hit the 'back' button after each and every viewed image
	also, because of the frames and relative nature of each subdir, you can send someone a link to just one limb in your whole dirtree of images, so they only see that dir and its subdirs.
	optional javascript highlighting (which is on by default) so you can tell both where [in the dirtree] you are and where you've been.
	generates numbers detailing how many images are in a dir's subdirs and puts that next to the subdir's name in the html output
	sorts thumbnails by aspect ratio; so portraits come first, then gradually down to landscapes
	handles bad image files and bad filenames gracefully by moving the "bad" files to a known location and logging the transfer