Once you have created a local directory of images with an index.html of
thumbnails, you will to open the index.html file with a text-editor
and do a batch find/replace on all the paths.
For example:
The paths to the large images might be something like
C:\user\photos\gallery\image-name.jpg
You will need to find all instances of the "C:\user\photos\" and
replace that with
http://www.happenstance.info/gallery/
So that all the URLs end up looking like
http://www.happenstance.info/gallery/image-name.jpg , etc etc
(If the html file is going to reside in the same directory as the
images you can just have /image-name.jpg as the path)
This will look like its broken on your local pc (the thumbnails won't
show) until you upload it to your web server.
chris