Avoid in-page links

Usability expert Jacob Nielsen says to avoid same-page links. Why? Almost all links work one way, so users expect the following:

• Clicking a link navigates you to a new place.
• After you click, the old page goes away.
• A new page loads into the window, replacing the old page.
• You first see the top of the new page.
• The Back button returns you to the old page.

Useit.com has a page of links to current issues in Web Usability