GreyBox Redux

# Greybox Redux (Reworked)

Reworked original greybox redux at http://jquery.com/demo/grey/

## See it in action:

- Launch Google (Overlay not clickable)
- Visit Yahoo (Overlay clickable)
- Microsoft would like a visit. (overlay clickable, animated)
- jQuery Rocks! (Overlay not-clickable, callback alert)
- jQuery Rocks! (Overlay not-clickable, callback alert, firefox only: greybox overflow set to hidden)