preventing arrow-key navigation

[Nicolas R Cueto]

Hello,

When I inadvertantly hit my keyboard's up/down arrow-keys, I was
surprised--and then distressed!--to see me moving between substacks.
Short of ripping out all the arrow-keys from my school's computers, how
do I prevent these or any other unbidden navigational key-events?
(Converting the stack into a standalone didn't do the trick.)

Thank you.

-- 
Nicolas R Cueto
Takakura JHS/SHS
Nagoya, Japan