[Ti] "Universal" Power Cord for Powerbook and Dell?

[Lists]

Realizing that some of you also live in "two worlds" when it comes to  
computers, I wonder if someone here might have any experience with a  
"universal" AC power adaptor which would work both with a Powerbook  
(15" 1.5Ghz) and an Inspiron 700m.

I need a spare power cord for the Dell and thought I could do the ol'  
two-birds/one-stone thing.

Thanks

TjL