HELP Snow flakes

Hi, need some help here.
I’m using the code from a tutorial on this site but instead of snowflakes it’s raining blood.
Th thing is that i want it only to rain in frame one, but it’s continues to the next scene even:(
Can someone help? I’m quite new to action script.
Thanks

I’m using this code for the Moive clip:


onClipEvent (load) {
    movieWidth = 800;
    movieHeight = 600;

    i = 1+Math.random()*2;
    k = -Math.PI+Math.random()*Math.PI;

    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) {
    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 this for frame one:


stop();
for (k=0; k<25; k++) {
    duplicateMovieClip(this.blodregn, "blodregn"+k, k);
}