public function initiate(parent:DisplayObjectContainer, tileSize:int, tilesX:int, tilesY:int, screenWidth:int, screenHeight:int, backgroundColor:uint, active:Boolean= true):void {
public function initiate(parent:DisplayObjectContainer, tileSize:int=40, tilesX:int=20, tilesY:int=15, screenWidth:int=800, screenHeight:int=600, backgroundColor:uint=0x000000, active:Boolean = true):void