How to change the dimensions of the Sprite object?

Hi all,
I am new to Flash and ActionScript 3.0 environment. I have only basical knowledge regarding this platform.

My issue/problem starts here:

  I have a Sprite object on the stage. 

What I should do in order to change the dimensions (viz.,size,colour, or both ,etc) of this Sprite object, when it gets clicked?

My sample code looks like this:

var circle:Sprite = new Sprite();

stage.addEventListener(MouseEvent.CLICK,onStage);
function onStage(e:MouseEvent):void
{
    circle.graphics.beginFill(0xff0000);
    circle.graphics.drawRect(event.localX+47,event.localY+47,7,7);
    trace("in stage's event listener");  
}

circle.addEventListener(MouseEvent.CLICK,onCircle);
function onCircle(evnt:MouseEvent):void
{
   trace("Inside circle's event listener.");
**   // required code should be added here.....**
}

I think, you have got my point.
Please, anyone help me regarding the issue by providing a simple solution.

I will be waiting or your repliesā€¦
Thanks in advanceā€¦

Srihari.Ch