Yep, Bobby is right. If you want the kind of results I'm guessing you want, you'll need to use premium rendering with at least 64 rays.per pixel. The same is true for soft shadows. Takes longer to render but I think the difference is worth it, HTH.
John

This is not my "second childhood". I'm not finished with the first one yet.

Time flies like an arrow; fruit flies like a banana.

"I'd like to die peacefully in my sleep like my grandfather....not screaming in terror like the passengers on his bus." - Jack Handy