Deadlock Problem

I am getting a number of deadlock errors in my log files and I was 
wondering if anyone knows how I can stop them.

Query failed: ERROR:  deadlock detected DETAIL:  Process 11931 waits for 
ShareLock on transaction 148236867; blocked by process 11932. Process 
11932 waits for ShareLock on transaction 148236866; blocked by process 
11931.

This is for a web application. Whenever a search result is displayed I 
need to update a counter to say it has been viewed which is done with 
between 1 and 15 updates in one transaction of the form.

BEGIN;
UPDATE stats SET click_count = click_count+1 WHERE id = '122'
UPDATE stats SET click_count = click_count+1 WHERE id = '123'
UPDATE stats SET click_count = click_count+1 WHERE id = '124'
etc...
COMMIT;

My lock management config is:
deadlock_timeout = 2000 # in milliseconds
#max_locks_per_transaction = 64 # min 10, ~200*max_connections bytes

I am using Postgres 8.0.3

Does anyone know how I can stop these deadlocks from occurring?

They are not a big problem as losing a few it only happens a couple of 
times a day but I prefer to have everything working as it should.

Thanks

Gavin