If only skinning a model was as easy as that, but its not I am afraid.
You have to paint the Weights onto the geometry. I suggest getting Mike McKinleys Character rigging tutorial from here it expalins painting weights and rigging from start to finish..
Chris (formerly R@nSiD)
Twitter
When the power of love overcomes the love of power the world will truely know peace - Jimmy Hendrix
Winner SM VFX Challenge 1
3rd Place SM SteamPunk Challenge (May 2007)