how to setup replicating data to oracle database

How do you setup replication from SQL Server 2000 to a oracle database? We want to push changes from sql sever to oracle, evertime sql server table is changed. I have a working ODBC connection. When I try setting up a push to the oracle side I can not find the subscriber In the list. Can someone point me in a direction, with a detailed way of doing this.Have you looked at Books Online yet? There's a topic in there titled "Oracle Subscribers". Just search for it.