[jQuery] new plugin version debug

Hi all, if you have just few minutes, i need help to debug the script
for the 1.1 version of pirobox.
It works with jQuery 1.3.1 and also, obviously with 1.2.6.
here is the link
http://www.pirolab.it/demo/index_b.html
any advice will be welcome
tnx in advance to all

Diego Valobra