Unusual problem (inverted colours)

Right, so I got a macbook a few weeks ago and everything's been going fine... until today. I'm not quite sure what caused it (perhaps I've had it turned on too long, or because my cat lay on it for a while and pressed some keys...) but all the colours on my screen are inverted. Blue is orange, green is red and so on.
It's not just an appearance change (in the appearance change it still says "blue" eventhough most of it is orange) because everything is inverted. From the icons to the menu, from pictures to the little Apple logo on the top left. I doubt it's a hardware problem as the original Mac OSX loading screen is still blue. From the moment it loads Mac OSC, however, everything turns orange and black and such.
If anyone knows how to invert it back to the normal colors, I'd be most thankful.
PS the suspect:
http://img233.imageshack.us/img233/4615/laptop2ug7.png
well, at least I got a nice pic out of it?

why exactly does a mac have the function of inverting colours?
It's for people who have vision problems and have trouble reading black-on-white text. It's part of the Universal Access system preferences (and can be turned on and off there as well as the keyboard shortcut).

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