Ideas on how to use external perl script

Hi:

I need to write a stored function that will perform a complex task which
has already been handled in OO subfunctions of an external perl module.
The perl module has many subroutines and OO constructs and may use
whatever else is legal to use in perl. (I do have the source code for
the perl module BTW) I need to interact with this per module from the
context of a stored function in my DB. I have v8.3.4 with pl-perl but
discovered that I cannot simple "use" the external perl module or simply
stick the named perl subs inside the module inside the pl-perl. Still,
I need to work with it. More specifically...

- A pl-pgsql function will load up a temporary table with a bunch of
records

- I need to run each of these records through a sub in the perl module
that loads an internal data structure in an OO object

- I then call another sub that processes the data structure and returns
the result.

- I purge the temporary table and then stuff it with the returned
results.

So I picture a regular ole pl-pgsql that (someonw) interacts with the
many perl module subs. One of those interarcions is to create a perl
object (OO perl).

Any suggestions on how to proceed?

Thanks

-dave