Anyone who can help....

I need help finding out who is sending threatening IM
messages thru AOL IM to my son who is 16 years old.

He has been harrassed in school locally daily since September 05
and even had another student (harrasser) drive their vehicle at him
while jogging on the side of the road as if to hit him.
His best friends car was vandalised and a tire slashed
on school grounds by these punks 2 weeks ago.

I have contacted the police but they havent
given me any indication that they will followup
on the threats that are happening over AOL IM.
The school is not doing anything beyond speaking
to the perpetrators, even after I
spoke to them in person twice and asking them
to contact the other parents. Which they havent.

Can anyone help me figure out how to nail these punks
and put a stop to this? Isnt there away to
find out what there IP address is or something like that?

Thanks,

Anneliese