Lightbox 2.0 Install

Installed this version (Lightbox 2.0) in a WordPress 2.0 site but photos only open/enlarge. No “Javascript” behavior as shown at http://www.m3nt0rs.de and at http://www.huddletogether.com/projects/lightbox2/.

Problem not:
. Browser-related
. Not page- vs. post-related
. Not theme-related (I don’t think)

Using WPAndreas01 theme.

What am I doing wrong? Help! (And thanks!)