How do i stop loading a swf file which is still in progress.

Question

//I have three buttons on the stage (btn1, btn2, btn3)
when i click the first button swf starts loading
while the swf is loading if i press the 2nd button
the first swf wont stop loading and both the swfs start playing
but if the first swf is fully loaded then every thing workes fine.
so please let me know how do i stop loading a file which is still in progress.
var _contentSWF:ContentSWF
var _content
btn1.addEventListener(MouseEvent.CLICK, handleClick)
btn2.addEventListener(MouseEvent.CLICK, handleClick)
btn3.addEventListener(MouseEvent.CLICK, handleClick)
function handleClick(){
    if(_content!=undefined){
        _contentSWF.removeContent()
        removeChild(_contentSWF);
        _contentSWF =null;
    _contentSWF = new ContentSWF()
    _content = addChild(contentSWF);
    _contentSWF.init(some path.swf)
//ContentSWF.as
private var _path:String
private var swfLoader:Loader
private var _content
public class ContentSWF extends Sprite{
    public function init(path){
        if(_content!=null){
            _content.content.removeEventListener(Event.COMPLETE, completeHandler)
            _content.removeChild(mymc)
            _content=null
        swfLoader=new Loader();
        _path = path
        swfLoader.load(new URLRequest(path));
        swfLoader.contentLoaderInfo.addEventListener(Event.COMPLETE, swfLoaded);
    public function removeContent(){
        swfLoader.contentLoaderInfo.removeEventListener(Event.COMPLETE, swfLoaded);
        swfLoader.unloadAndStop()
    private function swfLoaded(e:Event){
        _content = addChild(mymc)

Answer 1

Thanks Kglad, it all worked fine but can you help me in this.
I have 4 movieclips (_a,_b,_c,_d) when i click each of the movieclip they load a SWF(my_mc)
now when the swf file loades it starts loading a Sound(mp3)
Now when i press another button  (_b) while this mp3 is loading
all the methords like  Loader.close and loader.unloadAndStop() workes fine  but i dont know how dose the MP3 loades and start playing
I also used the below script in  my_mc.swf , but it wont work
this.addEventListener(Event.unload, myfun)
function myfun(e:Event){
\     if(_sound.bytesLoaded<_sound.bytesTotal){
          _sound.close()
     if (_chanel){
          _chanel.stop()