[Javascript] Calling images only when needed.

[Richard]

www.somestuff.batcave.net

Suppose that I wind up with 600 plus images I want to show off.
Is there a way to keep the thumbnails from downloading and causing a long
wait before the menu falls back to the collapsed state?
I don't see why I have to code in every cotton pickin image and force the
visitor to accept the 600 thumbnails.

Thanks all.