HELP! (Dynamic image loading problem)

:scream: :scream: :scream: This is driving me insane.
I have preformed like 10 searches in the Tuts and in the forums, and none of the accumulated info is helping me.
I am working on a menu bar for this non-profit and they want to be able to update the images in it with relative ease. So, I create a two layer button with a simple mouse over effect, and set behind the mouse over effect layer (inside the button) an empty MC. To which I attach some simple action script (Iā€™m not very proficient at this yet) which, if what I have been able to glean, is accurate should work.

I have attached a sample file.

Thank You,
S.P.III