Drawing Alg. Error

var road = ['=',' ','+','@','+',' ','='];

var xPos = 2;
var yPos = 2;

IO.exec("TITLE Zavada\'s Graphic Drawing Algorithm");
print "Starting loop";



func getTime(filename?){
	var file = (filename is (what is nil)?"a.time":filename+".time");

	IO.exec("echo %time%>"+file);
	return (String::IO.read(file)).split(":");

};
func getDate(filename?){

	var file = (filename is (what is nil)?"a.date":filename+".date");
	IO.exec("echo %date%>"+file);

	var dayDate = (String::IO.read(file)).split(" ");

	var date = dayDate[1].split("/");

	date[2] = date[2].head(4);
	date = toNumbers(date);

	return date;
};

func toNumbers(arr){

	for(var i = 0; i < arr.len; i+=1){

		arr[i] = Number::arr[i];

	}
};

func getMillis(){

	var time = getTime();
	time[2] = time[2].sub('\n', "");
	toNumbers(time);

	var date = getDate();

	return 	(date[0]-1) * 2629800 + date[1] * 86400 + (date[2] - 1970) * 31557600
			+ time[0] * 3600 + time[1] * 60 + time[2];

};

func deltaTime(a,b){

	return [ a[0]-b[0] , a[1]-b[1], a[2]-b[2] ];

};

func drawRoad(){

	for(var i = 0; i < road.len; i += 1){
		var str = "";
		for(var j = 0; j < 48; j += 1){

			if(xPos == j && yPos == i){
				str += '#';
			}else{
				str += road[i];
			}

		}

	}

};

var lastTimeMoved = 0;
var    lastTimeUp = 0;

var frequency = .016;
var     hertz = 1/frequency;

for(;true;){

	var currentTime = getMillis();

	if(currentTime-lastTimeUp >= .016){

		drawRoad();

		lastTimeUp = currentTime;
		print "\n"*256;

	};

	if(currentTime - lastTimeMoved >= 1){

		xPos = (xPos+1 > 48 ? 0 : xPos + 1);

		lastTimeMoved = currentTime;

	};

}

print "Done";