Changing the speed of MovieClip

Question

Hi, I am new to Flash and Actionscript and am currently working on some code pulled from another post to try and learn from what others are doing or have done. I have created a star movieclip and am attempting to move it randomly accross the stage in a relatively slow speed. When I run it, it moves randomly but way too fast. I have spent the last 6 hours playing with the code, researching help files and also looking up other discussions but nothing seems to be helping. Here is what I have so far. My apologies if the code looks like a hack. This is being done in CS4 if that matters at all. If anyone could shed some more light on how to handle controlling the speed or rate of random movement with some insight, I would be greatful.
Thanks,
Ather
//-- import the flash classes first for tweening
import fl.transitions.Tween;
import fl.transitions.easing.*;
//-- the ENTER FRAME event is needed to animate and move objects via script and moves it through frames
addEventListener(Event.ENTER_FRAME, starMove);
//-- this function keeps moving the star across the screen
function starMove(e:Event):void {
    var Speed:Number = 5;
    var Sx:Number;  // x speed
    var Sy:Number;  // y speed
    var dx:int = Math.random();
    var dy:int = Math.random();
    star_mc.x = (Math.random() * stage.stageWidth);
    star_mc.y = (Math.random() * stage.stageHeight);
    Sx = Math.random() * Speed;
    Sy = Math.random() * Speed;
    star_mc.x += Sx * dx;
    star_mc.y += Sy * dy;

Answer 1

The problem is that you recalculate all the parameters inside enterFrame event listener and I don't see any algorithm that makes sense in terms of these calculation. Here is an example how it can be done in principal (replace star Sprite with you object):
// replace it with your star
var star:Sprite;
// speed along x
var sx:Number;
// speed along y
var sy:Number;
// direction along x
var dx:Number;
// direction along y
var dy:Number;
// maximum speed
var maxSpeed:Number = 5;
init();
function init():void
     star = new Sprite();
     var g:Graphics = star.graphics;
     g.beginFill(0xff0000);
     g.drawRect(0, 0, 20, 20);
     g.endFill();
     addChild(star);
     // position it so it is always visible at start
     star.x = stage.stageWidth * .25 + Math.random() * stage.stageWidth * .5;
     star.y = stage.stageHeight * .25 + Math.random() * stage.stageHeight * .5;
     // initital parameters are random
     sx = Math.random() * maxSpeed;
     sy = Math.random() * maxSpeed;
     dx = Math.random() > .5 ? 1 : -1;
     dy = Math.random() > .5 ? 1 : -1;
     // start animation
     addEventListener(Event.ENTER_FRAME, moveStar);
function moveStar(e:Event):void
     star.x += sx * dx;
     star.y += sy * dx;