addChild and removeCurrent child - actionscript-3

Question

I have multiple buttons that load multiple movie clips. My problem is that when one loads it does not go away prevent the others to load when their button is clicked. Here is my code below. Do I need to add and "if" statement? Any help would be greatly appreciated. Thanks.
movieButton.addEventListener(MouseEvent.CLICK, gotoMovie);
webButton.addEventListener(MouseEvent.CLICK, gotoWeb);
mailButton.addEventListener(MouseEvent.CLICK, gotoMail);
function gotoMovie(event:Event):void {
var moviescene:MovieClip = new movie();
stage.addChild(moviescene);
}
function gotoWeb(event:Event):void {
var webscene:MovieClip = new web();
stage.addChild(webscene);
}
function gotoMail(event:Event):void {
var contactscene:MovieClip = new contact();
stage.addChild(contactscene);
}

Answer 1

I'm not entirely sure what you want to achieve, but I guess this should help.
var currentScene:MovieClip; // pointer to scenes
movieButton.addEventListener(MouseEvent.CLICK, gotoMovie);
webButton.addEventListener(MouseEvent.CLICK, gotoWeb);
mailButton.addEventListener(MouseEvent.CLICK, gotoMail);
// function that sets new scenes
function setScene(mc:MovieClip):void {
if(currentScene) stage.removeChild(currentScene);// if a scene is already loaded, remove it
currentScene = mc; // set currentScene to new scene
stage.addChild(currentScene); // add it to stage
}
function gotoMovie(event:MouseEvent):void {
setScene(new movie());
}
function gotoWeb(event:MouseEvent):void {
setScene(new web());
}
function gotoMail(event:MouseEvent):void {
setScene(new contact());
}