Here's something you can try:
Based on what you've shown me so far, you have at least two, possibly more, "extra" directories made by Frontpage that need to be uploaded. These are named "_themes" and "contents", and I'm guessing you can find them in the same place on your computer. To be safe, you might want to try uploading anything else that's in the same folder as well.
Figuring out where to put what directory in your webspace is going to be a bit like a jigsaw puzzle. As you recall, the Gallery.htm page wants to reference this:
The ../ means that it will go one level up from the directory Gallery.htm is placed in (origamiinteractive.com), and look for "_themes" in your home directory. As you upload directories from Frontpage, you need to find cues from the HTML like the example above and then place the directories accordingly.
Hope this helped.