Safari Display Becomes Distorted Intermittently

HI Techyv,
I am using a MacBook 2.4GHz Intel Core 2 Duo running on Mac OS X 10.6.8 (Snow Leopard).
There are times that Safari suddenly is being distorted after some time of use.
This usually happens when I have multiple tabs open and I click to go to another tab. Neither Safari nor the OS freezes since I can very well navigate in Safari when it happens – the window just has a distorted image.
What is wrong with my Safari and how can I remedy it?
I am running on Version 5.1 6534.50. I am unable to post an image of it since its intermittent.
I will do whenever it happens again.
