MACROMEDIA FLASH MX 2004 - ACTIONSCRIPT Reference Manual page 99

Use similar code to check if the Left Arrow, Up Arrow, or Down Arrow key is being pressed.
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Your code should look like this:
var distance = 10;
car.onEnterFrame = function() {
with (car) {
if (Key.isDown(Key.RIGHT)) {
_x += distance;
if (_x >= 400) {
_x = 400;
}
_root.display_txt.text = "Right";
} else if (Key.isDown(Key.LEFT)) {
_x -= distance;
if (_x < 0) {
_x = 0;
}
_root.display_txt.text = "Left";
} else if (Key.isDown(Key.UP)) {
_y -= distance;
if (_y < 0) {
_y = 0 ;
}
_root.display_txt.text = "Up";
} else if (Key.isDown(Key.DOWN)) {
_y += distance;
if (_y > 300) {
_y = 300;
}
_root.display_txt.text = "Down";
}
}
}
Select Control > Test Movie to test the file.
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For more information about the methods of the Key class, see the
"ActionScript Dictionary," on page 205.
Creating interactivity and visual effects
Key class entry in Chapter 12,
99