How do I use unloadAndStop?

I have several buttons which load an external swf into a loader.
Here is the code for three of the buttons:

reelButton.addEventListener(MouseEvent.CLICK, reel);
function reel(event:MouseEvent):void {
var reelLoader:Loader = new Loader();
addChild(reelLoader);
var url:URLRequest = new URLRequest("reel.swf");
reelLoader.load(url);
}

studioButton.addEventListener(MouseEvent.CLICK, studio);
function studio(event:MouseEvent):void {
var studioLoader:Loader = new Loader();
addChild(studioLoader);
var url:URLRequest = new URLRequest("studio.swf");
studioLoader.load(url);
}

faqButton.addEventListener(MouseEvent.CLICK, faq);
function faq(event:MouseEvent):void {
var faqLoader:Loader = new Loader();
addChild(faqLoader);
var url:URLRequest = new URLRequest("faq.swf");
faqLoader.load(url);
}

The site is temporarily posted here http://markac.com/

As you can see the “reelButton” loads a swf with video and audio.
The problem is that the audio from the “reel” page continues to play when I load a new page.
How would modify this code in order to implement the “unloadAndStop” function in AS3 so that when I click on the “studioButton” and the “faqButton” the sound which was loaded from the “reelButton” will unload and Stop?