[jQuery] drag & drop not working under IE and Safari

[jQuery] drag & drop not working under IE and Safari


Hi,
I'm working on this drag & drop script: http://www.lesperimento.netsons.org/various/jquery-mousemove/
It works on Firefox and Opera but not at all on IE and Safari.
The events seemed not to start at all...
Any idea how to solve it?
I tried to put some alert as well but they don't start, like if
javascript were disabled.
But it's not because in some other pages it works.
Thank you in advance