Flash Fireworks actionscript

// Action script...

// [Action in Frame 1]
function createParticle(x, y, angle, power)
{
    var _loc1 = new Object();
    _loc1.x = x;
    _loc1.y = y;
    _loc1._initTime = getTimer();
    _loc1.exploded = false;
    _loc1.fArr = new Array();
    angle = -angle;
    power = -power / 2 + power + power;
    _loc1.vx = Math.cos(angle) * power;
    _loc1.vy = -Math.sin(angle) * power;
    return (_loc1);
} // End of the function
function positionParticle(particle)
{
    var _loc2 = Math.floor((getTimer() - particle._initTime) / 1000);
    particle.x = particle.x + particle.vx;
    particle.y = particle.y + particle.vy;
    if (particle.y > floor)
    {
        makeExplode(particle);
        fired = false;
    } // end if
    particle.vy = particle.vy + gravity;
    particle.vy = particle.vy * res;
    particle.vx = particle.vx * res;
    if (_loc2 >= 2)
    {
        if (particle.exploded == false)
        {
            particle.fArr = makeExplode(particle, 100);
            --fw_num;
            particle.exploded = true;
        } // end if
        false;
    } // end if
} // End of the function
function makeExplode(particle, num)
{
    var _loc1 = new Array();
    for (i = 0; i < num; i++)
    {
        _loc1[i] = makeExplode_frag(particle);
    } // end of for
    return (_loc1);
} // End of the function
function makeExplode_frag(particle)
{
    var _loc1 = new Object();
    _loc1.det = false;
    _loc1._initTime = getTimer();
    _loc1._dieTime = 2000 + random(2000);
    _loc1.x = particle.x;
    _loc1.y = particle.y;
    angle = Math.random() * 6.283185;
    power = 1 + Math.random() * 4;
    _loc1.vx = Math.cos(angle) * power;
    _loc1.vy = -Math.sin(angle) * power;
    return (_loc1);
} // End of the function
function makeExplode_move(frag)
{
    frag.fTime = Math.floor(getTimer() - frag._initTime);
    frag.x = frag.x + frag.vx;
    frag.y = frag.y + frag.vy;
    frag.vy = frag.vy + gravity / 2;
    frag.vy = frag.vy * res;
    frag.vx = frag.vx * res;
    fw_bit.setPixel32(frag.x, frag.y, particlecolor);
    if (frag.fTime >= frag._dieTime)
    {
        if (frag.det == false)
        {
            frag.det = true;
        } // end if
    } // end if
} // End of the function
Stage.scaleMode = "noScale";
var bg_bit = new flash.display.BitmapData(Stage.width, Stage.height, false, 0);
var bg_mc = _root.createEmptyMovieClip("bg_mc", _root.getNextHighestDepth());
bg_mc.attachBitmap(bg_bit, this.getNextHighestDepth());
var fw_bit = new flash.display.BitmapData(Stage.width, Stage.height, true);
var fw_mc = _root.createEmptyMovieClip("fw_mc", _root.getNextHighestDepth());
fw_mc.attachBitmap(fw_bit, this.getNextHighestDepth());
var baseMatrix = new flash.geom.Matrix();
var fade = new flash.geom.ColorTransform();
fade.alphaMultiplier = 0.900000;
var fired = false;
var floor = 375;
var launch = new flash.geom.Point(Stage.width / 2, floor);
var gravity = 0.020000;
var res = 0.970000;
var max_fw = 3;
var particlecolor = 4294967295.000000;
var particleglowcolor = 65280;
var particles = new Array();
var glow = new flash.filters.GlowFilter(particleglowcolor, 10, 10, 10, 10);
var fw_num = 0;
fw_mc.filters = [glow];
fw_mc.blendMode = "add";
onEnterFrame = function ()
{
    if (fw_num < max_fw)
    {
        fw_mc.onPress = function ()
        {
            ++fw_num;
            var _loc1 = new flash.geom.Point(_xmouse, _ymouse);
            var _loc2 = Math.atan2(_loc1.y - launch.y, _loc1.x - launch.x);
            var _loc3 = flash.geom.Point.distance(launch, _loc1) / 45;
            particles.unshift(createParticle(launch.x, floor, _loc2, _loc3));
            if (particles.length > max_fw)
            {
                particles.length = max_fw;
            } // end if
        };
    }
    else
    {
        delete fw_mc.onPress;
    } // end else if
    fw_bit.colorTransform(fw_bit.rectangle, fade);
    for (i in particles)
    {
        currparticle = particles[i];
        fw_bit.setPixel32(currparticle.x, currparticle.y, particlecolor);
        positionParticle(currparticle);
        for (j in currparticle.fArr)
        {
            makeExplode_move(currparticle.fArr[j]);
            if (currparticle.fArr[j].det == true)
            {
                currparticle.fArr[j] = null;
            } // end if
        } // end of for...in
        if (currparticle.exploded == true)
        {
            currparticle.x = Stage.width * 2;
            currparticle.y = Stage.height * 2;
        } // end if
    } // end of for...in
};