weird graphical problem

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got my macbook a few weeks ago, just noticed a few bizarre graphical issues, the image below is a picture of what I mean. I get sort of fuzzy areas around the corners of some frames. Anyone got any bright ideas for fixing it, or should I get on to apple?

http://img233.imageshack.us/my.php?image=picture1vg8.png

 

[square_imp]

gah, that is depressing, as I bought it online could I take it to a local apple repair place or would it involve posting it back to them?

 

[square_imp]

update: have not had a recurrences of any issues and ran an extensive hardware test (from osx cd) which came back clean after 47mins. Does the hardware test check the video hardware for issues?