"Go to top" kind of functionality

Hey guys, I’m not sure what the correct term for this is, but here’s the scenario…

I have a webpage that’s really long vertically. When you reach the bottom of the screen, I want to have something similar to the usual “go to top” button, except I want it to only go to like halfway up the page. In addition, I don’t want it to just jump straight there, I want it to quickly scroll up, so the whole thing is visible to the user.

For an example…

http://fotologue.jp/

Scroll to the bottom of the page, and hit one of the “Refresh” buttons. Obviously, the idea is to be able to change the content of a long list, without forcing the user to manually scroll back up each time.

Thanks much guys! I’m not a complete Flash newb, but I may as well be an AS newb, so please keep that in mind.