Problems with Oracle dB oci8 connectivity

Hello,
I need to connect from my Windows server over to an Oracle database in
Unix land. I finally got the Oracle client loaded on my server, and, I
downloaded and installed the oci8 gem from rubyforge.

Here's the top of my script.

require 'oci8'
require 'dbi'

begin
# connect to the Oracle server
dbh = DBI.connect("DBI:Oracle:graphicsdb-prod.bna.com/grpprod.bna.com",
"user", "password")
...

I get the following error:

        "Unable to load driver 'Oracle.'"

I'd appreciate any help on this.

Thanks.

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