Button link to keyboard

I have 7 flash button like following:
http://www.oniva.com/upload/1356/bu.jpg

each button has on (release) function when button is clicked some event occur

But how can I link button to “UP” “DOWN” and “ENTER” key of my keyboard?

“UP” = high light next button = mouse over
“DOWN” = high light previous button = mouse over
“ENTER” = click on the button