var game = new Phaser.Game(800, 600, Phaser.AUTO, 'phaser-example', { preload: preload, create: create, update: update });

var tilesprite;
var cursors;

function preload() {

    game.load.image('starfield', 'assets/misc/starfield.jpg');

}

function create() {

    tilesprite = game.add.tileSprite(0, 0, 800, 600, 'starfield');

    cursors = game.input.keyboard.createCursorKeys();

}

function update() {

    if (cursors.left.isDown)
    {
        tilesprite.tilePosition.x += 8;
    }
    else if (cursors.right.isDown)
    {
        tilesprite.tilePosition.x -= 8;
    }

    if (cursors.up.isDown)
    {
        tilesprite.tilePosition.y += 8;
    }
    else if (cursors.down.isDown)
    {
        tilesprite.tilePosition.y -= 8;
    }

}