How to change mouse trailer script so it follows the path

Hi! I found nice dynamic mouse traile which i’d like to use on my flash banner. I can get rid of mouse actions but how do make random sparkles move from left side of banner to the right side? Here is mouse trailer code:

//import bitmap class
import flash.display.BitmapData;
//Settings
var particleMaxSpeed:Number = 3;
var particleFadeSpeed:Number = 5;
var particleTotal:Number = 5;
var particleRange:Number = 25;
/**

  • createExplosion(target X position, target Y position)
    */
    function createExplosion(targetX:Number, targetY:Number):Void
    {
    //run for loop based on particleTotal
    for (var i:Number = 0; i<particleTotal; i++) {
    //attach bitmap from the library with the linked name “adobe_flash”
    var myBmp:BitmapData = BitmapData.loadBitmap(“fire.jpg”);

//create the “main_holder” movieclip that will hold our bitmap
var particle_mc = _root.createEmptyMovieClip(“main_holder”, _root.getNextHighestDepth());

//create an “internal_holder” movieclip inside “main_holder” that we’ll use to center the bitmap data
var internal_holder:MovieClip = particle_mc.createEmptyMovieClip(“internal_holder”, particle_mc.getNextHighestDepth());

//set “internal_holder” x and y position based on bitmap size
internal_holder._x = -myBmp.width/2;
internal_holder._y = -myBmp.height/2;

//finally, attach the bitmapData “myBmp” to the movieclip “internal_holder”
internal_holder.attachBitmap(myBmp, internal_holder.getNextHighestDepth(), “never”, true);

//set position & rotation, alpha
particle_mc._x = targetX
particle_mc._y = targetY
particle_mc._rotation = random(360);
particle_mc._alpha = random(50)+50;

//set particle boundry
particle_mc.boundyLeft = targetX - particleRange;
particle_mc.boundyTop = targetY - particleRange;
particle_mc.boundyRight = targetX + particleRange;
particle_mc.boundyBottom = targetY + particleRange;
//set speed/direction of fragment
particle_mc.speedX = Math.random(particleMaxSpeed)-Math.random(particleMaxSpeed);
particle_mc.speedY = Math.random(particleMaxSpeed)-Math.random(particleMaxSpeed);
particle_mc.speedX *= particleMaxSpeed
particle_mc.speedY *= particleMaxSpeed

//set fade out speed
particle_mc.fadeSpeed = Math.random(particleFadeSpeed)*particleFadeSpeed;

//just a visual particle counter
numberOfParticles++;
//make fragment move using onEnterFrame
particle_mc.onEnterFrame = function():Void
{
//update alpha, x, y
this._alpha -= this.fadeSpeed;
this._x += this.speedX;
this._y += this.speedY;
//if fragment is invisible or out of bounds, remove it
if (this._alpha <= 0 || this._x < this.boundyLeft || this._x > this.boundyRight || this._y < this.boundyTop || this._y > this.boundyBottom)
{
this.removeMovieClip();
//
numberOfParticles–;
}
}
}
}
/**

  • Mouse Controls
    */
    //create an object that we’ll listen to
    mouseListener = new Object();
    //on Click, createExplosion
    mouseListener.onMouseDown = function() {
    //createExplosion(_xmouse, _ymouse);
    }
    mouseListener.onMouseMove = function() {
    createExplosion(_xmouse, _ymouse);
    }
    //add listener
    Mouse.addListener(mouseListener);

I’ll appreciate any help. Thank you!