Why does laptop keyboard jump around?

Make sure you are not inadvertently touching the pointing device.

Keyboard legs fold under, and the keyboard bumps the touchpad. People rest their wrists on the laptop keyboard, and brush their hands across the touchpad by accident.

Only on A2K? You are referring to the cursor, right?

If you have either of these songs playing in the background, that might be the reason.

http://www.youtube.com/watch?v=1V5wkOtIJ6s

http://www.youtube.com/watch?v=DwQbPgouUYo

Another cause could be if you are using a laptop with a touchpad, you are inadvertently touching the pad in the middle of typing. This would re-adjust where your cursor hits on the page.

That's odd. The language you use in your reply is remarkably similar to mine. (Except while I was trying to be funny posting videos as part of my answer, you were straightforward.)

There are inexpensive laptop mouse products like Logitech -- I bought the corded after I got tired of replacing the batteries in the wireless.