iPhoto import/export

[Malcolm Hamilton]

Apologies right off the bat - - I suspect there's a better place to 
ask this question, but I've checked a bunch of apple/support pages, 
and asked at the local Apple store, and can't find the answer to a 
simple (I think) question.  If anyone can point me in the right 
direction, or answer it themselves, I'd be very grateful.

I have a G4 powerbook and a G4 Tower.  I want to copy my 2,000 photos 
which are in iPhoto on my powerbook into iPhoto on my Tower (once 
they're safely copied, I'll probably delete a bunch on the powerbook, 
because currently iPhoto runs very slowly, I guess because it's 
overloaded).

I can connect both computers via ethernet.

But I can't seem to copy the albums from the powerbook to the Tower! 
I've tried dragging and dropping to no avail.  I've tried 'Import', 
and 'Export', to no avail.  I don't know what to try next.

Is there something obvious that I'm missing?  Is there some 3rd-party 
software that would make this whole thing easier?  (By the way, I 
also want to update iTunes on my Tower - - I'm hoping whatever works 
for iPhoto will work for iTunes!?)

Thanks, malcolm