Remove Array Elements from stage

Hey Guys and Gals. I have the following code that duplicates a movie clip on my stage. At the end of my web banner I am having trouble making the movie clips disappear. It’s an online banner so when the banner loops I don’t want the duplicated clips to stay on the stage I just want them to clear off and have it start from scratch again. I’ve tried popping them through a function and the removeChild statement. Just stuck at the moment. Thanks!

//This array will hold all the rectangles on the stage
var rectangles:Array = new Array();

//In this loop, we’ll create 50 rectangles
for (var i = 0; i < 25; i++) {

//Create one rectangle
var rectangle:Rectangle = new Rectangle();

//Assign a random position
rectangle.x = 15;
rectangle.y = 85;

//Add the rectangle on to the stage
addChild (rectangle);

//Add the rectangle to the array
rectangles.push (rectangle);

}

//The timer will call the “shakeRectangles” function every 0.02 seconds
var timer:Timer = new Timer(20, 100000000);
timer.addEventListener (TimerEvent.TIMER, shakeRectangles);
timer.start ();

//This function is responsible for animating the shake
function shakeRectangles (e:Event):void {

//Loop through the array
for (var i = 0; i < 25; i++) {

//Rotate the rectangle a random amount  (from -4 to 4) 
rectangles*.rotation += Math.random() * 1 - 0.5;

//Assign a new random position
rectangles*.x += Math.random() * 2 - 1;
rectangles*.y += Math.random() * 2 - 1;

}
}