How could I get the kw popup window to open over the whole page?
Q: I know that the code on this pages is horrible and if this was a new site I would not build in frames.
However, as you can see the full size images are constrained, presumably because they are in a frame.
I've put the same slideshow on other page - no frames - correct size images.
A: If you install your gallery inside the iFrame, the overlay window will open inside it, not inside the whole page.
There is no way to fix it.
You should try to install VisualLightBox gallery directly on the page.