Active Sessions - killing them via Sql

Greetings.

I need to be able to call the DROP DATABASE via Sql - i.e. I cannot run any
scripts on the actual POSTGRES server as I am remotely connecting to it over
TCP/IP via JDBC.

Unfortunately I need to kill off any active connections to the specified
database before the DROP DATABASE command will work.

Is there anyway from within a JDBC connection to say the template1 database
as the superuser on a POSTGRESQL server to:

1. Determine what connections are open and active to a specified database
(this I can get from the stats tables)
2. Kill ALL these sessions. (or specifiy each and kill thme
individually)...

I am using POSTGRES version 7.3.2.

Thank you in advance,

Carl Olivier