deadlocks

Hi all!
I'm having a very strange deadlock problem in PostgreSQL 7.3.2 under RedHat Linux. All connections to this database come from Tomcat's 4.1.24 connection pooling mechanism, and for some reason frequently I have lots of INSERTs in "waiting" state. But what they're writing for?? To me seems one insert is waiting for the other one... anyone have tips on how can I find what's my problem? Here is a listing I got on my server using "ps -ax |grep post"

30132 ? S 0:01 postgres: postgres w2 192.168.5.54 INSERT waiting
30133 ? S 0:01 postgres: postgres w2 192.168.5.54 idle in transactio
30145 ? S 0:00 postgres: postgres w2 192.168.5.54 idle in transactio
30168 ? S 0:00 postgres: postgres w2 192.168.5.54 INSERT waiting
30180 ? S 0:00 postgres: postgres w2 192.168.5.54 INSERT waiting
30183 ? S 0:01 postgres: postgres w2 192.168.5.54 idle
30184 ? S 0:00 postgres: postgres w2 192.168.5.54 idle
30185 ? S 0:00 postgres: postgres w2 192.168.5.54 INSERT waiting

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