I'm helping a professor prepare a presentation and I'll be uploading
images I scan for him to his website.  Is there any pre-existing HTML
code that can take all the images in a directory and put boxes next to
each, allowing him to enter a numeric sequence?  This doesn't need to
be the final presentation method, just a way for him to reorder the
slides easily through the web.  I guess this requires code that can
modify a sequencing file on the website.  Honestly although I know
some basic HTML and Java, I don't know how to read from and write to a
file, so I wouldn't know how to do this myself if necessary.  If
there's nothing out there, though, could you suggest some tutorials so
I could write this myself?  Thanks.

It might be simplest just to use a web site that manages photo albums
for consumers.  PhotoIsland.com, for example, supports this kind of
sequencing.  But of course, there may be reasons you can't or don't
want to go that way.