var thumbArr:Array = new Array();//for thumbs
var mcArr:Array = new Array();//holds all box movieclips

var whichCategoryXML:String = "category1.xml";
loadFirstTime(whichCategoryXML);//first time

var categoryXML:XML = new XML();
var categoryXMLLoader:URLLoader;//

function loadFirstTime(whichCategoryXML:String):void {
	categoryXMLLoader = new URLLoader();
	categoryXMLLoader.addEventListener(IOErrorEvent.IO_ERROR, ioError_categoryXML, false, 0, true);
	categoryXMLLoader.addEventListener(ProgressEvent.PROGRESS, progress_categoryXML, false, 0, true);
	categoryXMLLoader.addEventListener(Event.COMPLETE, complete_categoryXML, false, 0, true);
	categoryXMLLoader.load(new URLRequest(whichCategoryXML));
}
function ioError_categoryXML(e:IOErrorEvent):void {
	trace("ioError_categoryXML: " + e);
}
function progress_categoryXML(e:ProgressEvent):void {
}
function complete_categoryXML(e:Event):void {
	categoryXML=XML(e.target.data);
	for (var i:int = 0; i < categoryXML.image.length(); i++) {
		thumbArr.push(categoryXML.image[i].thumb);
	}
	categoryXMLLoader.removeEventListener(IOErrorEvent.IO_ERROR, ioError_categoryXML);
	categoryXMLLoader.removeEventListener(ProgressEvent.PROGRESS, progress_categoryXML);
	categoryXMLLoader.removeEventListener(Event.COMPLETE, complete_categoryXML);
	categoryXMLLoader=null;

	startLoading();
}
function startLoading():void {
	addEventListener(Event.ENTER_FRAME, center, false, 0, true);
	for (var i = 0; i < categoryXML.image.length(); i++) {
		var box:Box = new Box();
		mcArr.push(box);

		box.title_txt.text = categoryXML.image[i].title;
		box.topic_txt.text = categoryXML.image[i].topic;

		box.addEventListener(MouseEvent.CLICK, clickThumb, false, 0, true);
		box.addEventListener(MouseEvent.ROLL_OVER, overThumb, false, 0, true);
		box.addEventListener(MouseEvent.ROLL_OUT, outThumb, false, 0, true);
		box.addEventListener(MouseEvent.MOUSE_DOWN, startDragThumb, false, 0, true);
		box.addEventListener(MouseEvent.MOUSE_UP, stopDragThumb, false, 0, true);
		box.mouseChildren = false;
		thumbSprite.addChild(box);

	}
	//
	var row:int = 5;//rows in horizontal by default
	var limit:int = categoryXML.image.length();
	var col:int = Math.ceil(limit/row);
	createGrid(col,row,260,86,5,5, false);//returns point array

	tweenThumbs();//tweens movieClips to their position on stage
	loadImage();
}
function loadImage():void {
	thumbLoader = new Loader();
	thumbLoader.load(new URLRequest(thumbArr[0]));
	thumbLoader.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, thumb_IOError, false, 0, true);
	thumbLoader.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS, thumb_Progress, false, 0, true);
	thumbLoader.contentLoaderInfo.addEventListener(Event.COMPLETE, thumb_Complete, false, 0, true);
	thumbArr.splice(0,1);
}
function thumb_IOError(e:IOErrorEvent):void {
	trace("thumb_IOError: " + e);
}
function thumb_Progress(e:ProgressEvent):void {

}
function thumb_Complete(e:Event):void {
	e.target.removeEventListener(IOErrorEvent.IO_ERROR, thumb_IOError);
	e.target.removeEventListener(ProgressEvent.PROGRESS, thumb_Progress);
	e.target.removeEventListener(Event.COMPLETE, thumb_Complete);

	mcArr[loadedThumbs].addChild(thumbLoader);
        thumbLoader.x = thumbLoader.y = 8;

	mcArr[loadedThumbs].preloader_mc.stop();//this line works

	trace(mcArr[loadedThumbs].preloader_mc);//it traces just fine one way or another
	for(var i:int = 0;i<mcArr[loadedThumbs].numChildren;i++){
		trace(mcArr[loadedThumbs].getChildAt(i).name);
	 }

	mcArr[loadedThumbs].removeChild(mcArr[loadedThumbs].getChildByName("preloader_mc"));//this line causes an error
	//TypeError: Error #2007: Parameter child must be non-null. at flash.display::DisplayObjectContainer/removeChild() at MethodInfo-108()
	mcArr[loadedThumbs].preloader_mc = null;

	if (thumbArr.length>0) {
		loadedThumbs++;
		loadImage();
	}else {
          trace(finished);
        }
}
//**********************************************************************************************
function clickCategory(e:MouseEvent):void {

	for each (var item in mcArr) {
		item.removeEventListener(MouseEvent.CLICK, clickThumb);
		item.removeEventListener(MouseEvent.ROLL_OVER, overThumb);
		item.removeEventListener(MouseEvent.ROLL_OUT, outThumb);
		item.removeEventListener(MouseEvent.MOUSE_DOWN, startDragThumb);
		item.removeEventListener(MouseEvent.MOUSE_UP, stopDragThumb);
	}
	for(var i:int = 0;i< mcArr.length;i++){
		thumbSprite.removeChild(mcArr[i]);
		mcArr[i] = null;
	}

	//reset all
	mcArr = [];
	imageArr = [];
	pointArr = [];
	thumbArr = [];
	loadedThumbs = 0;

	var whichCategoryXML:String = "category" + e.target.id + ".xml";
	loadFirstTime(whichCategoryXML);
}