Google "site ripper" and you'll get something like this,
Best Free Web Site Ripper
You'll want one that can follow links. Since all sites have links to other sites you want to also control how many levels deep it goes. I've got a couple that I swear would keep following links till they've downloaded the entire internet.
I'm on a Mac so can't recommend a good PC ripper.
Experiment.
Edit: looks like they are .sid format. Do you have a compatible viewer?
http://www.lizardtech.com/download/dl_options.php?page=viewers