Scripting demo 2

import flash.events.Event;
import flash.events.KeyboardEvent;

var moveRight:Boolean = false
var moveLeft:Boolean = false
var moveUp:Boolean = false
var moveDown:Boolean = false

var ship:MovieClip = new Ship();


 ship.x=275
 ship.y=200




addChild(ship);

stage.addEventListener(Event.ENTER_FRAME,moveShip);

function moveShip(event:Event) {

if (moveRight==true) {
ship.x+=3;
}

if (moveLeft==true) {
ship.x-=3;
}

if (moveUp==true) {
ship.y-=3;
}

if (moveDown==true) {
ship.y+=3;
}

}

//listen to keyboard being pressed.
stage.addEventListener(KeyboardEvent.KEY_DOWN,pressKey);
stage.addEventListener(KeyboardEvent.KEY_UP,stopship);

//if not pressed set move ship to false
function stopship(myevent:KeyboardEvent):void{
moveLeft=false;
moveRight=false;
moveUp=false;
moveDown=false;

}

//if pressed set move ship to true.
function pressKey(myevent:KeyboardEvent):void{
if(myevent.keyCode==Keyboard.RIGHT){
moveRight=true;

}

if(myevent.keyCode==Keyboard.LEFT){
moveLeft=true;
}

if(myevent.keyCode==Keyboard.UP){
moveUp=true;
}

if(myevent.keyCode==Keyboard.DOWN){
moveDown=true;
}
}