Logging back to beginning of conversation

[OKB (not okblacke)]

    Hi.  I'm using Pidgin.  When I hit "Enable logging" in an IM convo, 
it begins logging from that point.  What I'd like is for it to log all 
of the conversation up to that point, and continue logging from that 
point on.  (That is, I want to be able to log the entire conversation by 
enabling logging at any point during it.)  How can I do this?

Thanks,
-- 
--OKB (not okblacke)
Brendan Barnwell
"Do not follow where the path may lead.  Go, instead, where there is
no path, and leave a trail."
	--author unknown