no images in Derby docs when I build them on my machine

[Rick Hillegas]

I don't see any images in the Derby documentation which I build on my 
machine. Apparently, this has been going on for years. The images do 
turn up in the generated documentation in the release distributions 
which I have built over the past several years. But they don't turn up 
when I issue the following command from my docs sandbox:

  ant -quiet html
The source for the images is certainly in the codeline in my sandbox. 
But the images are not being copied to the output directory.

Any suggestions about what the problem might be?

Thanks,

-Rick