[jQuery] small issue with script ( working in firefox not in ie )

[jQuery] small issue with script ( working in firefox not in ie )


HI
I made the following small script
http://z.nu.nl/menu/drop2.htm
if you click an arrow that section folds open and the arrow is changed
to the selected one.
However this is working in Firefox but not in IE ( tested in 6 and 7 )
How can I get this to work in IE also?
thanks in advance
Armand