How to setup a memory foam mattress?

I was just wondering what is usually used as a base for a memory foam mattress. I know for a traditional mattress a box spring is usually used. But i dont have any bed or box spring and was going to purchase what i needed but i didnt really know where to start. thanks

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American-made memory foam . .

http://www.isoform.com/index.php?osCsid=56b1ic3eru5407ntv5rln18m07

http://www.sleepwarehouse.com/index.asp?PageAction=VIEWCATS&Category=15

http://www.healco.com/mattresses.html