public void init(GameContainer container) throws SlickException {
// load the sprites and tiles, note that underneath the texture
// will be shared between the sprite sheet and tilemap
SpriteSheet sheet = new SpriteSheet("testdata/scroller/sprites.png",32,32);
// load the tilemap created the TileD tool
map = new TiledMap("testdata/scroller/map.tmx");
// build a collision map based on tile properties in the TileD map
blocked = new boolean[map.getWidth()][map.getHeight()];
for (int x=0;x<map.getWidth();x++) {
for (int y=0;y<map.getHeight();y++) {