wondering how prepared statements work?

Hi All,

I'm trying to put pg_bouncer between my app and postgres, but  
occasionally, I'll run into "prepared statement 'dbdpg_x' already  
exists" errors.  I've been looking through the source code for  
DBD::Pg, but to no avail, looking for where the "PREPARE dbdpg_x AS  
<statement>" code is at.  I'm hoping to add a little bit that would  
check for the existence of a prepared statement, and to rename the  
prepared statement to dbdpg_x+<something else> if dbdpg_x already  
exists.

Any pointers on where to look?

Thanks!
--Richard