Snow falling: pls help with actionscript

Question

Hallo,
I made a flash movie with snow  falling from the sky in Flash 8 (actionscript 2.0)
However, the snow I made differs  from the original.
The original is here:
http://www.kirupa.com/developer/mx/snow.htm
I  put mine here:
http://toetssite.webs.com/
You  will notice that my snow only falls downward: there is no randomness  for the flakes to go left or right. there is no movement.
WHere  in the script below can I change that so that there's more movement for  the flakes? Thank you
I use  the following script for the snow itself:
onClipEvent (load) {
     //specifies the size of the movie stage
     movieWidth = 300;
     movieHeight = 200;
     //variables that will modify the falling snow
     i = 1+Math.random()*2;
     k = -Math.PI+Math.random()*Math.PI;
     //giving each snowflake unique characteristics
     this._xscale = this._yscale=50+Math.random()*100;
     this._alpha = 75+Math.random()*100;
     this._x = -10+Math.random()*movieWidth;
     this._y = -10+Math.random()*movieHeight;
onClipEvent (enterFrame) {
     //putting it all together
     rad += (k/180)*Math.PI;
     this._x -= Math.cos(rad);
     this._y += i;
     if (this._y>=movieHeight) {
         this._y = -5;
     if ((this._x>=movieWidth) || (this._x<=0)) {
         this._x = -10+Math.random()*movieWidth;
         this._y = -5;
and on the first frame of my movie I put the following:
for (k=0; k<50; k++) {
    duplicateMovieClip(this.snow,  "snow"+k, k);
Thank  you!

Answer 1

Just initialize the rad variable. I added following line to your code and it works fine.
     rad = 0; //line I inserted.
No other change required. It is advised to initialize all your variables before you use them.
Anyways, below I am providing the whole script for the snow after modification
onClipEvent (load) {
//specifies the size of the movie stage
movieWidth = 300;
movieHeight = 200;
rad = 0; //line I inserted.
//variables that will modify the falling snow
i = 1+Math.random()*2;
k = -Math.PI+Math.random()*Math.PI;
//giving each snowflake unique characteristics
this._xscale = this._yscale=50+Math.random()*100;
this._alpha = 75+Math.random()*100;
this._x = -10+Math.random()*movieWidth;
this._y = -10+Math.random()*movieHeight;
onClipEvent (enterFrame) {
//putting it all together
rad += (k/180)*Math.PI;
this._x -= Math.cos(rad);
this._y += i;
if (this._y>=movieHeight) {
this._y = -5;
if ((this._x>=movieWidth) || (this._x<=0)) {
this._x = -10+Math.random()*movieWidth;
this._y = -5;