What is the key difference ?

What is the key difference ?


Matt Kruse has an nice and simple jQuery "ideas page". I could not
make it work for me.
http://dbj.org/h.htm
The difference is I am using the latest jQuery.And I have also removed
some parts from Matt's page.
The first example. "Details" Table . My page is (obviously) not
working. Why?
Link to the Matt's page is there. His page uses (I think) jQ 1.2 and
is working.
Simple Tree View works on both pages.
Also when using IE the behaviour of my page is much worse.
Any advice? Idea?
--DBJ