Squeaky MacBook

I purchased my black macbook about two weeks ago. It works really well, but now it has developed a squeak on the left side of the casing. You can feel a little give if you push on the side near the two screws. Does anyone know why this would happen? Is there a way to tighten it up?

Thanks,
mab

I think that's normal. The two screws on the left side are for aesthetic reasons only.

Pacman