My mom is not getting any younger, and is having trouble changing her TV input with her remote. All she needs to do it switch from cable TV to her DVD player and back. I don't want her to have to learn a whole new remote. Is there a simple, big-button remote that I can program JUST to toggle between the two inputs? She could then use her familiar remote for regular operations. I would disable other buttons on the remote to prevent unintended changes that would be hard for her to recover from. Thanks for any thoughts.