I'd like to have a vertical list of items and next to them I'd like to place
two vertical sets of check boxes. Let's say one set is the YES column, and
the other set is the NO column.

How do I set it up so that a user CANNOT check both YES and NO... ? So, if
someone checks YES, then changes their mind and checks NO, then the check in
he YES column would disappear and vice versa?

Does this involve complicated code?

THANKS IN ADVANCE!!