Scroll with arrow keys

1

I need to control Kirupas content scroller by pressing up or down arrow keys. The code below is the up button from the Kirupas experiment. What should it be changed in code to fit for Up arrow key?

btnUp.onPress = function()
{
this.onEnterFrame = function()
{
dragger._y = Math.max(top, dragger._y-moveSpeed);
updateContentPos();
};