Drag the following DEZOOMIFY link to your bookmarks toolbar. (Or right-click and Bookmark This Link.)
Then go visit your ANOM page, like maybe this one, and then click the bookmark you just created (it's actually a "bookmarklet").
It will open a new tab/window at http://ophir.alwaysdata.net/dezoomify/dezoomify.html with the right address information already filled in. You may need to disable form autofill in your browser if it interferes.
Then just click Submit Query on that page.
When dezoomify is done collecting image tiles, right-click on the resulting image and save it to your computer.