Screen shaking / jumping

Hi I've had a strange issue appear on my Macbook Pro within the last few weeks. Every few minutes my screen shakes/jumps! It always starts from the top and if I leave it, it will work its way down to cover the whole screen.
I can't figure out what it is, i've read a few other people with this issue but for them it seems to be interference (like a nearby TV or speakers). I don't have anything magnetic around my laptop, and i've never had this problem before (the mac is now over 4 years old).
Here are some screen shots to show what I mean:
http://tinyurl.com/626beuq
http://tinyurl.com/62be7g7
Nothing I'm doing seems to start the problem, in fact it will happen whether i'm at my macbook or not. To fix it I have to tightly hold the screen for a second and it stops, or sometimes moving the screen around, but it will start backup within a few seconds.
My guess is maybe it's hardware, the screen is toast?
Here are my macbook specs.
Processor  2.4 GHz Intel Core 2 Duo
Memory  2 GB 667 MHz DDR2 SDRAM
Graphics  NVIDIA GeForce 8600M GT 256 MB
Software  Mac OS X Lion 10.7.2 (11C74)

To reproduce shaking/flicker: double click home button to close apps, then return to home screen by clicking on home button or tapping on home screen and you can see the screen re-adjust (jump/flicker).

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