As I understand it, it's program that creates a static set of HTML/jpeg files
and I really want something "dynamic". That is, I should perhaps add a few
requirements:

+ It should be searchable

+    It should support keywords, and be able to generate an album with
    photos that has a certain keyword if the user so desires. (that is,
 the user clicks on a keyword then the program should search for all
 photos that has this keyword and show them)

+ I should be able to upload photos to the site and the program should
 be able to extract and display the EXIF/IPTC fields I want.

+ I should be able to use a photo scaled to a certain size on a web
 page outside the gallery, that is I should be able to use a image
 link like this
 <img src="http://gallery.example.com/img/xxxx.jpg?height=600&width=800">
 and the gallery would serve a picture that was scaled to a maximum
 of 800px wide/600px tall.

I'm not sure what 'image index' is, I don't think my Google search turned up
what you are referring to.

Thanks, I'll check it out

Ohhh yes, but unfortunately it looks like I can't do one thing. I've tried to
find the solution by asking on the Gallery forum pages but after several
months the only answer I've got is that it should work like I expect but no
one can show me how to do it :)

So I've put in a bug report/feature request, but while waiting to see what
happens with that one I thought I would see what my alternatives are.