public Image collisionMap(TiledMap tm) throws SlickException
    {
        Image map = new Image(tm.getWidth()*32, tm.getHeight()*32);
        int li = tm.getLayerIndex("Collision");
        org.newdawn.slick.Graphics g;
        g = map.getGraphics();

        for(int x = 0; x<tm.getWidth(); x++){
            for(int y = 0; y<tm.getHeight(); y++){
                if(tm.getTileImage(x, y, li)!=null){
                    g.drawImage(tm.getTileImage(x, y, li), x*32, y*32, Color.white);
                }
            }
        }

        return(map);
    }