Flash upload progress bar problem

import flash.net.FileReference;
 
 
var reference:FileReference = new FileReference();
var listener:Object = new Object();
 
//server script
var scriptLocation:String = 'uploader.php';
 
var progressBarHeight:Number = 10;
var progressBarY:Number = 50;
var progressBarColor:Number = 0x66ccff;
 
uploadButton_mc._visible = false;
 
chooseButton_mc.onRelease = choose;
uploadButton_mc.onRelease = uploadCurrent; //upload file
 
function choose():Void {
	reference.browse([{description:'All Files (*.*)', extension:'*.*'}]);
}
function uploadCurrent():Void {
	chooseButton_mc._visible = false;
	progressBar = makeProgressBar(0, progressBarY);
	reference.upload(scriptLocation);
}
 
listener.onSelect = function(file:FileReference):Void {
	display_txt.text = file.name;
	uploadButton_mc._visible = true;
}
 
listener.onProgress = function(file:FileReference, bytesLoaded:Number, bytesTotal:Number):Void {
	
	percent = Math.ceil(bytesLoaded*100/bytesTotal);
    display_txt.text = file.name+' - '+ percent +'%';
	progressBar._width = Math.ceil(Stage.width*(bytesLoaded/bytesTotal));
	percent_txt.text = bytesLoaded + "/" + bytesTotal;
}
 
listener.onComplete = function(file:FileReference):Void {
    removeMovieClip(progressBar);
	display_txt.text = '';
	uploadButton_mc._visible = false;
	chooseButton_mc._visible = true;
}
 
//attach Listener to the FileReference Object
reference.addListener(listener);
 
 
/***********************************************************/
function makeProgressBar(x:Number, y:Number):MovieClip {
	var bar:MovieClip = createEmptyMovieClip('progressBar_mc', 0);
	bar._visible = false;
	bar.beginFill(progressBarColor);
	bar.lineTo(Stage.width, 0);
	bar.lineTo(Stage.width, progressBarHeight);
	bar.lineTo(0, progressBarHeight);
	bar.lineTo(0, 0);
	bar.endFill();
	bar._width = 0;
	bar._visible = true;
	bar._x = x;
	bar._y = y;
	return bar;
}
/*************/

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