Keyboard left/right control converting as3 to as2

1

here is a code that was done in as3
it allows the user to use the keyboard keys to go laft and right from frame to frame

stage.addEventListener(KeyboardEvent.KEY_DOWN, fl_changeSlide);
function fl_changeSlide(evt:KeyboardEvent):void
{
if(evt.keyCode == 37) // LEFT
{
gotoAndStop(this.currentFrame-1);
}
else if (evt.keyCode == 39 || evt.keyCode == 32) // RIGHT OR SPACE
{
gotoAndStop(this.currentFrame+1);
}
}
stop();

but i need to know how to do it in as2
if at all possible