Ok, so I have a two-column layout that looks something like this:
And as you can read on that page. I want the blue #side DIV to scroll along on the page WHEN the viewport "hits" it. I.e if I scroll the page 50px nothing will change, the DIV will scroll along with the viewport, but when the browser viewport "hits" it, it will scroll along, to make sure that it's always shown, when I scroll back up it should remain in it's current position.
If you don't understand, follow the instructions to look at the Apple Store, and you should get an idea on what I'd like.