[Apple iPod] How do you sync on different computers, without erasing all files first?

I'm attempting to load one classic 80gb iPod with two laptop computers.
The reason is that both computers have loads of media (movies) of
about 40gb each. I've loaded all from the first laptop, and am
now attempting to send the movies from the second one.

Even in manual mode, Itunes wants to erase all the files that are
on the iPod from the first laptop.

Is there any to get one ipod to be happy with more than one computer
with out wanting to erase all the files first? Maybe another utility?

Thanks for your help.

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