If they are normal web graphics, that would still need an awful lot of files. I'd only expect that kind of size if you were uploading a lot of full-size photos, and resizing to web size in the browser. As I remember, you just had graphics as part of the page design (plus a couple of photos), which should be pretty small.

How do you edit the site? Do you have a local version which you then upload? Or even just local copies of all the graphics? If so, how much space does it take up on your local machine?