Help someone, HELP. Excel 2003 problem.

I am trying to do a spreadsheet for my son to help him in the maths area of
his schoolwork.
What is the formula to put in a cell, that if he gets the answer correct,
the cell would turn green and a sound clip could play with cheers, and if he
got it wrong, the cell would turn red with a sound clip that could say, Try
again.

I would be most appreciative if someone could help me on this, or if they
could ask a friend who is a fundi @ excel.