cursor moves across screen on its own
I have a phantom user on my new macbook version 10.5. I've noticed quite a few times now how the cursor will just start moving across the screen from left to right on its own. I've taken my hands off the keyboard/pad and I've even placed the laptop on a flat surface (table) and stopped touching it. But, the cursor will still float across the screen. I move it back to the left and remove my hands, and it again floats to the right.
I've Googled on this and only found some info on this phenom for Dells. Anyone know what might be causing this to happen? Is there a preferrence or setting I can adjust?
Thanks for any info!
macbook, Mac OS X (10.5)