Movimentar um scroller com o teclado

Olá pessoal.

Eu estou usando um scroller, funciona muito bem. Mas eu gostaria que ele pudesse ser controlado também pelas setas "up" e "down" do teclado. Seria possível editar o código de forma que ele aceitasse as duas formas de controle?

Segue o código do mesmo.

Agradeço qualquer dica.

:D

// ok here is the load event handler

// diff_y is the total amount that the scrollbar can movethe bound_box is a movie clip that surrounds everything. its just a clear box

// next line we set bounds to the bounding area of the bound_box clip getBounds() returns 4 variable yMin yMax xMin & xMax they are the bounding area that well use for a lot of stuff

// top is the highest amount the scrollbar can go

// bottom is the lowest

// updateScrollbar() is the function for setting the content clip to the right spot

// "scroller._y - top/diff_y" is a percent of the scroll bar's position we multiply it by the amount we can scroll of the content

// friction is how much the scrollbar should slow down by after throwing it

onClipEvent (load) {

	diff_y = bound_box._height-scroller._height;

	bounds = bound_box.getBounds(this);

	top = bounds.yMin+(scroller._height/2);

	bottom = bounds.yMax-(scroller._height/2);

	function updateScrollbar () {

 content._y = -(((scroller._y-top)/diff_y)*(content._height-bound_box._height));

	}

	friction = 0.90;

}

// this detects if you clicked on the scroller it starts a drag with the scroller to be from the "top" which we defined earlier to the "bottom"

// we then set scrolling to true

onClipEvent (mouseDown) {

if (scroller.hitTest(_root._xmouse, _root._ymouse)) {

 startDrag ("scroller", false, scroller._x, top, scroller._x, bottom);

 scrolling = true;

	}

}

// here we stop the drag and set scrolling to false

onClipEvent (mouseUp) {

	stopDrag ();

	scrolling = false;

}

// every frame it sees if your scrolling then it updates the scrollbar to the right place based on the y position of the scroller

// it also calculates the speed of your scrolling

onClipEvent (enterFrame) {

	if (scrolling) {

 updateScrollbar();

 newY = scroller._y;

 yspeed = (newY-oldY)*0.50;

 oldY = newY;

 done = false;

	} else if (!done) {

 // here it adds the speed to the y position of the scroller

 // then it asks if the speed is at a number that you can see it moving if it is then it decreases the speed by multiplying it by a decimal

 oldypos = scroller._y;

 newypos = oldypos+yspeed;

 if (yspeed<-0.2 || yspeed>0.2) {

 yspeed *= friction;

 } else {

 yspeed = 0;

 done = true;

 }

 // the next two if statements test if it hit the top or bottom if it had it makes the speed negative to what it is so itll change its direction - neat bounce effect to it

 if (newypos<top) {

 yspeed = -1*yspeed*friction;

 newypos = top;[/code]

 }

 if (newypos>bottom) {

 yspeed = -1*yspeed*friction;

 newypos = bottom;

 }

 // here we set the scrollers y position to newyposition (the variable we are adding the speed to)

 // it then sets the mc to whereever the scroller is

 // then its going to keep on doing this enterFrame business untill speed has reduced itself to 0

 scroller._y = newypos;

 updateScrollbar();

	}

}