I want to make a 2 player car game, and I have one player, the buttons are up, down, left and right. I want the second player's buttons to be w, s , a, and d. How can I do this? This is the movement script, please change it so that the buttons I listed will be used for the same script.

onClipEvent (enterFrame) {
// This code will advance the car forward.
if (Key.isDown(Key.UP)) {
speed += .5;
}
// This will make the car go backwards
if (Key.isDown(Key.DOWN)) {
speed -= .5;
}
// The car will start to slow down after the speed of 10
if (Math.abs(speed)>5) {
speed *= .5;
}
// This will change the angle of the car
if (Key.isDown(Key.LEFT)) {
_rotation -= 4;
}
if (Key.isDown(Key.RIGHT)) {
_rotation += 4;
}
// here is where the hittest is for the boundary
speed *= .98;
x = Math.sin(_rotation*(Math.PI/180))*speed;
y = Math.cos(_rotation*(Math.PI/180))*speed*-1;
if (!_root.land.hitTest(_x+x, _y+y, true)) {
_x += x;
_y += y;
} else {
speed *= -.6;
}
}