Advice on Laptop for Poker?

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I need a laptop to play poker on for a short period of time, and after that I have no need for the laptop no more. Can someone be so kind and borrow me their laptop for a couple of weeks?

Ok, ok. [img]/images/graemlins/wink.gif[/img]

I'm looking at buying a used laptop but don't want to spend much money on it. What would you say are the minimum requirements regarding screen size (1-2 tables, some overlap is ok), cpu mhz and memory?