Good bikes for BIG people?

What is the best (most sturdy and comfortable) bike to get for someone who weighs about 400lbs? And if I ride this awesome (imaginary) bike to work, what do I do? Do I take it inside? Chain it to something? I really have no idea how this works... ... ALSO, I live in a somewhat rainy area, so something that gets good traction on wet ground would be great too. :)

Some of the ones I'm looking at:

www . amazon . com/Diamondback-Serene-Comfort-26-Inch-17-Inch/dp/B002E3KPGK/ref=sr_1_1?ie=UTF8&s=sporting-goods&qid=1255735596&sr=1-1
www . amazon . com/Schwinn-Loop-7-Speed-Folding-Bike/dp/B000Y2PRTI/ref=sr_1_4?ie=UTF8&s=sporting-goods&qid=1255735529&sr=1-4

Any other suggestions would be great.

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