Touch screen funny

I recently found my old DS phat. But the touch screen is now dodgy. One half (the right) worked fine, while when you hit the middle it jumps so that the touch screen is to the left of your stylus. I did about 30mins of calibrating and now its the otherway round! Anyone know if this is fixable? Maybe a proper reset of teh DS back to factory settings?

Cheers

This would be a good place to ask. Where can I get a touch screen replaced? Would be good down the road when my screen is scratched up.

there are various places on line that will do it - or youtube videos so you can do it yourself :D