how: closable javascript announcement on page like one on digg

Just wondering if anyone knows how to easily acheive the same 'notice' type affect digg.com has with their 'annoucing digg swarm', then when you close it the rest of the content moves up the page.

Its kinda like a dhtml popup but is integrated with page content.

 

They are hidden div layers I expect.

 

Check out

http://developer.yahoo.com/yui/examples/container/module.html

for similiar examples using there framework.

 

probably a combination of Javascript and DHTML, the entire thing is enclosed in a div with an ID, and the ID's innerHTML attribute is overwritten with no HTML to some HTML and vica versa, not to hard.