Laptops for Africa

My sister and I (hopefully) are going to Africa this summer on a mission.  Part of the mission is AIDS awareness, the other part is teaching the school over there about computers.  We are in need of 4 laptops to take over and leave at the school.  We will be teaching them how to use (right from the start like how to turn on, use mouse, etc).  I am not sure yet of the min. specs. /system requirements that are needed.  Nothing to fancy: basic word processing/document and spreadsheet creation, etc. 

Do you, or anyone that you know, have any old laptops that you would love to get off your hands (or out of your garage)?  The oranization will provide donation receipts.  I have not heard back yet on if we have any payment ability.  

I believe we would need these in the Seattle area in June to get them set up to go.  I will be going to Seattle in June - so I can carry them with me.

Thanks!
Jeanna