ActionScript 3.0 :: Error Reading Multi-line .txt File?

I'm reading a 2d array from a .txt file, this is what I do:

Code:
[Embed(source = '../lib/lvl1front.txt', mimeType = "application/octet-stream")]
private var frontTxt:Class;

Then a bit further:

Code:
var fgString:String = new frontTxt();
foreGround = stringToArray(fgString);

The stringToArray function is where things go horribly bad:

Code:
private function stringToArray(input:String):Array
{
var output:Array = new Array();

[code]...

Notice the starting comma on every line except the first? I think it's the newline character somehow interfering, but I've tried everything I can think of, and nothing has helped.