complete unload external swf and sound

i am using this code for load and unload an external swf

for a button ,

when i click on button , swf loads and when again i click on button

swf unloads but still sound exist and just swf screen disappeare

please correct this code, i want swf complete unload,

thanks alot

Code:

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printer.addEventListener(MouseEvent.CLICK, fl_ClickToLoadUnloadSWF);

var fl_Loader:Loader;

//This variable keeps track of whether you want to load or unload the SWF
var fl_ToLoad:Boolean = true;

function fl_ClickToLoadUnloadSWF(event:MouseEvent):void
{
    if(fl_ToLoad)
    {
        fl_Loader = new Loader();
        addChild(fl_Loader);
        fl_Loader.load(new URLRequest("quiz.swf"));

        fl_Loader.addEventListener("UnloadVideo", unloadFunction)
        function unloadFunction(event:Event):void
{

Loader(event.currentTarget).unloadAndStop();

}


printer.x=100;
printer.y=100;
    }
    else

    {      fl_Loader.unloadAndStop();

        removeChild(fl_Loader);
        fl_Loader = null;

printer.x=155;
printer.y=334;
    }
    // Toggle whether you want to load or unload the SWF
    fl_ToLoad = !fl_ToLoad;
}

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