How to move a particle system with arrow keys?

Question

I have a little "ice fountain" particle effect and I want to
be able to move it like an object. How do I use actionscript to
effect a group particle system? (or have collision detection
features for that matter)
Code:
this.createEmptyMovieClip("holder2_mc",
this.getNextHighestDepth());
for(i=0;i<50;i++) {
var k:MovieClip = holder2_mc.attachMovie("ice","ice"+i
,holder2_mc.getNextHighestDepth());
k._y = 350;
k._xscale = Math.random()* 55 + 35;
k._yscale = Math.random()* 55 + 35;
k._x = Stage.width/2 -150;
k._rotation += Math.random()* 90 -45;
k.gotoAndPlay(Math.ceil(Math.random()*16));

Answer 1

fixed:
holder2_mc coordinates had to be loaded outside onEnterframe
and outside the "for" but inside an onLoad, and the initial k
coordinates had to be shut down.
------------- Code --------------------
onLoad = function(){
holder2_mc._y = 350;
holder2_mc._x = Stage.width/2;
onEnterFrame = function(){
if(Key.isDown(Key.UP)){
holder2_mc._y -= 5;
if(Key.isDown(Key.DOWN)){
holder2_mc._y += 5;
if(Key.isDown(Key.LEFT)){
holder2_mc._x -= 5;
if(Key.isDown(Key.RIGHT)){
holder2_mc._x += 5;
if(Key.isDown(Key.SPACE)){
//trace(holder2_mc._y);
holder2_mc._rotation += 15;
this.createEmptyMovieClip("holder2_mc",
this.getNextHighestDepth());
for(i=0;i<150;i++) {
var k:MovieClip = holder2_mc.attachMovie("ice","ice"+i
,holder2_mc.getNextHighestDepth());
//k._y = 350;
k._xscale = Math.random()* 55 + 35;
k._yscale = Math.random()* 75 + 25;
//k._x = Stage.width/2 -150;
k._rotation += Math.random()* 90 -45;
k.gotoAndPlay(Math.ceil(Math.random()*16));
//k._y -= Math.random()* 100 +25;
//k._x += Math.random()* 100 -50;