Simple way to show a message bar at the top of a page

Question

I would like to implement something like stackoverflow does, the bar at top of the page that shows some message.

I came across this pretty nice effect with a page bounce too:

http://www.slidedeck.com/features/ (look at the purple top bar coming down)

Is there a simple way to do this? Maybe with only jQuery or other framework?

Answer 1

How about this? :) Just add some fancy graphics and it should be good to go!