Can't do multiple levels of modal pop-up

[craftyknave]

I'm not sure if this was ever intended, but if not it would make a great feature! :-)

When you have one lightbox, and you try to add another on top of it, it doesn't enforce modal-ness of the second. The first overlays the background and prevents user interaction with it, The second pops on top (if you set the z-index right), but doesn't overlay the previous lightbox or prevent the user from interacting with it.

To give a concrete example, I've used this for a wizard. The wizard itself is a lightbox, that changes contents as you move from step to step. The page behind is overlaid and inaccessible, which is good. Sometimes at a step transition it is necessary to provide pop-up feedback to the user. I don't particularly want to overlay the wizard (this could be dealt with via opacity), but I do want the pop-up to be modal, and prevent the user from using the wizard until the pop-up is dismissed.