Unload content

Hello I’m newbie with as 3.0 i made some test to create a simple navigation between A and B swf files; when the B file load the A file remains, How can i remove or unload the A file?

this is the script:

stop();

Square.addEventListener(MouseEvent.CLICK, clickB);

function clickB(event:MouseEvent) {
var myLoader:Loader = new Loader();
addChild(myLoader);
var url:URLRequest = new URLRequest(“B.swf”);
myLoader.load(url);
}

Sample in the file

Thanks for the help…