Background Fader?

[Moh]

Well for important site announcements I am using Drop-In Content box.
http://www.dynamicdrive.com/dynamicindex17/dropinbox.htm

And I was woundering if any one knows how to add a background fader to make it stand out more and once they close it the fader disables.

Thanks for any help.

[RedCrisps]

http://dynamicdrive.com/dynamicindex17/interstitial.htm