docs: function(options) {
      if (typeof options === 'undefined') options = {};
  
      Mobil.call(this, options);
      this.target = null;
      this.targetX = null;
      this.targetY = null;
      this.origX = options.origX || 0;
      this.origY = options.origY || 0;
      this.origSpeedX = options.origSpeedX || 0;
      this.origSpeedY = options.origSpeedY || 0;
      this.origAccelX = options.origAccelX || 0;
      this.origAccelY = options.origAccelY || 0;
      this.tileWidth = options.tileWidth || 32;
      this.tileHeight = options.tileHeight || 32;
      this.mapWidth = options.mapWidth || 320;
      this.mapHeight = options.mapHeight || 240;
  }