I would go even one step further then the TSS yahoo member said. Turn off all the breakers to your basement before you wade in the water. Plug in the sub pump to the unplugged cord, as mentioned previously, then plug in the cord to an outlet you've flipped the breaker off to. This way your connection is complete, and you can flip the breaker on from a safe distance. If something shorts out, the breaker will simply trip, and no harm is done to you, or your house.
OPTION 2- Turn all the breakers off, and call in a Water Restoration company, such as Servpro, to come extract the water. They can also set up fans and dehumidifiers to dry the structure of your house, if necessary.