Image gallery in pure CSS

CSSPlay announced an image gallery which is maded purely on CSS.
You have a horinzontal navigation bar which opens a frame with different thumbnails. When hovering over an image you wil see the same image twice the thumbnail size.
For some tabs, like portraits and landscapes, you can see the image in the origal size of 640x480 px.
This is a nice application all done with CSS and not using any AJAX like code!