It's a subtle distinction, but consider a typical Tiger album. The visitor starts on a page that has thumbnails for whatever images are at the top level, and thumbnails at the top that lead to the folders. If he clicks on a folder thumbnail, he's taken to the page for
that folder, and again, there are image thumbnails and maybe thumbnails for subfolders.
When he clicks on an image thumbnail, that launches the lightbox that shows the slide image. Now, while he's looking at the slide image, he can call up a thumbstrip that contains a thumbnail for each of the other images in the current folder. But there are no links there to any
other folders - the thumbstrip shows only the other images in the current folder.
In Lucid, that first type of page isn't present - there's no "thumbnail page" as there is in Tiger (and most other skins). There are only slide images and an optional thumbstrip. Navigation to other folders is handled entirely by the menu tree on the left.
To a skin developer, these beasties are all very different, mostly because each of them requires a different approach to the variables that the jAlbum core makes available to the developer. Not so obvious to a user, who, thankfully, doesn't have to deal with it.
