Your example page is just filling the window with the stage
without resizing the content clip, then putting in a scrollbar
component and setting the size to the height of the window. I
actually do something similar in my portfolio.
First, if you need help with managing full browser flash,
check out the tutorial on gotoAndLearn.com. Then, just attach the
stuff you want to scroll to a scrollbar component, and you're
pretty much done.