private static String dirString(DirKey dk){
		if(dk==DirKey.Up){
			return "up";
		}
		else if(dk==DirKey.Down){
			return "down";
		}
		else if(dk==DirKey.Left){
			return "left";
		}
		else if(dk==DirKey.Right){
			return "right";
		}
		else{
			return "else";
		}
	}