Is there such thing as a trackpad cover?

Whenever I type, a part of my hand sometimes goes over the trackpad making the cursor go jittery all over the screen. Is there such a thing as a trackpad cover to cover the pad when you're using a mouse?

if you go into the system preferences you can have the trackpad disabled when you have an external mouse connected or if you dont want that the pad will be disabled when you are typing if you want

hehe, i don't know why i didn't think of that... i'm new at this notebook stuff, i've had many macs in the past, but they were all desktops. this is my first notebook =)