Class and constructor

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1 
class Iso {
	private var xOrg:Number;
	private var yOrg:Number;
	//
	function Iso(flashWidth:Number, flashHeight:Number, offsetY:Number) {
		yOrg = flashHeight-offsetY;
		xOrg = flashWidth/2;
	}
	//
	private function yFla(xIso, yIso) {
		return (yOrg-(yIso+xIso)/2);
	}
	private function xFla(xIso, yIso) {
		return (xIso+xOrg)-yIso;
	}
	//
	public function setPixelQuality() {
		_quality = "LOW";
	}
	//
	public function MoveIsoTo(x_iso, y_iso) {
		_root.moveTo(xFla(x_iso, y_iso), yFla(x_iso, y_iso));
	}
	public function DrawLineTo(x_iso, y_iso) {
		_root.lineTo(xFla(x_iso, y_iso), yFla(x_iso, y_iso));
	}
}

i get an error:
*Error C:\Documents and Settings\Bojan Jazbinsek\My Documents\iso\iso.as: Line 1: The class ‘Iso’ needs to be defined in a file whose relative path is ‘Iso.as’.
class Iso {

*tnx for help