how to change size of embedded movie clip.

have you tried setting ldr.width and ldr.height.

it should help

I would but I don't know how... Thanks!

ok I tried adding it like this but it didn't work. the swf did not appear
...
var imageLoader:Loader;
var ldr:Loader = new Loader();
      ldr.width = 569;
      ldr.height = 163;
ldr.load (new URLRequest("slideshow.swf"));
ldr.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, ldError);
ldr.contentLoaderInfo.addEventListener(Event.COMPLETE, ldComplete);
slideshow.addChild(ldr);
stop()
function ldComplete(ev:Event)
{
}
function ldError(ev:Event)
{
}

I had a similar problems when loading external swf's into a main movie that has a fluid (re-sizable) layout. I solved it by placing the following code in the first frame of all the swf's that I loaded:

stop();
//Important! Initiate when completely loaded

function isLoaded():void {
      addEventListener(Event.ADDED_TO_STAGE, init);
}
isLoaded();
function init(e:Event):void {
      removeEventListener(Event.ADDED_TO_STAGE, init);
      stage.scaleMode = StageScaleMode.NO_SCALE;
      stage.align = StageAlign.TOP_LEFT;
      stage.addEventListener(Event.RESIZE, sizeListener);
      stage.dispatchEvent(new Event(Event.RESIZE));
}

And in case you were wondering, I use the following code to load swf's with a preloader:

//preloader
var _swfLoader:Loader;
var _swfContent:MovieClip;
function loadSWF(path : String):void {
      var _req : URLRequest = new URLRequest ();
      _req.url = path;
      _swfLoader = new Loader ();
      setupListeners(_swfLoader.contentLoaderInfo);
      _swfLoader.load(_req);
}
function setupListeners(dispatcher : IEventDispatcher):void {
      dispatcher.addEventListener(Event.COMPLETE, addSWF);
      dispatcher.addEventListener(ProgressEvent.PROGRESS, preloadSWF);
}
function preloadSWF(event : ProgressEvent):void {
      var _perc : int = (event.bytesLoaded / event.bytesTotal) * 100;
      percentTxt.text = _perc + "%";
      progress_mc.gotoAndStop(_perc );
}
function addSWF(event : Event):void {
      event.target.removeEventListener(Event.COMPLETE, addSWF);
      event.target.removeEventListener(ProgressEvent.PROGRESS, preloadSWF);
      trace("Load Complete");
      this.percentTxt.visible = false;
      this.progress_mc.visible = false;
      _swfContent = event.target.content;
      this.addEventListener("close", unloadSWF);
      extContainer.addChild(_swfContent);
}

function unloadSWF(event : Event):void {
      _swfLoader.unloadAndStop();
      extContainer.removeChild(_swfContent);
      extContainer._swfContent = null;
}

For this to work, you'll need 2 movieclips, extContainer (this is where movieclips are loaded and you should place it where you want the external swf's should appear) and progress_mc (which is the preloader animation, and a dynamic textfield with an intance name of percentTxt, to see the progress numerically.

If you need more help, maybe you can send your fla so that I can take a look

ok, I tried adding the code you mentioned but my as3 has some similar code already and I couldn't get it to work. take a look at my project here...

 joeymerchant.com/project.zip.

open website.swf to see what I mean with slideshow.swf becoming out of scale. let me know when you have downloaded the zip. thanks!