Using JavaScript, you can also make it easier for the user to quickly navigate

[brumbino]

Using JavaScript, you can also make it easier for the user to quickly navigate the document outline. You can allow the user to hide irrelevant portions of the outline, leaving only the portions that are important to him or her.

[adakist]

You can do this by making the outline a dynamic document created on the fly instead of a static document loaded from the server.