Preview at the bottom of the page?

The Codex mentions this about Preview:

This button, located next to the Publish button in advanced mode, saves the post and displays the post in the Post Preview section at the bottom of the page. You can then see what the post will look like and continue editing.

I recently upgraded from a hopelessly outdated version of WordPress to 2.7 and I was wondering what I have to do to bring back the preview section on the Add New Post and Edit Post pages. Is it still possible?

(Thanks in advance and I apologize if this has been asked before – I couldn’t find anything via search.)