How To Limit Vertical Page Scrolling?

[videopro]

I have a need to have users land on a single html webpage, with some of them landing at various different bookmarks on the page. I do not want them to have the ability to vertical-scroll into content related to the other bookmarks.

This is a data gathering form-page that im' trying to segment the input by categories without the user aware of the other categories. It's a somewhat legacy script accepting the input, so not much flexibility in the layout design, hence this need and approach.

Other ideas for how to approach appreciated too.

[acoder]

Possibly have divs hidden and only one div showing with content required. The legacy script should accept that because all fields should be submitted when you press submit. Perhaps if you provide some code it would help.