yeah dude, looks like you softbinded your skin, which means you have weights to paint

select your mesh
in the animation menu set go
Skin > Edit Smooth Skin > Paint Skin Weights Tools > []

check out the maya tutorial help (Help > Maya Help > Learning Resources > Tutorials > Character Setup > Lesson 2 Smooth Skinning) for smooth skinning in action




heh, if this was XSI you could just grab the vertecies and click local reassign and then on the joint and you're problem would be solved