[Plugin: Lightbox 2] Limit size of lightbox?

Is there a way to limit the size of the lightbox? For example, on very tall images, the lightbox causes lots of scrolling, and on really wide images, it creates a lot of horizontal scrolling, which is annoying.

So is there a way to limit the size of the lightbox, which would scale the large images, or, a way to make the lightbox automatically scale to the size of the window if the image is larger than the window size? If not, it would be a nice feature.