Prototypes:"Simple question"? Not for me. Help please

Hi,
I’m trying to use a prototype function from http://proto.layer51.com
this is the code
[AS]
MovieClip.prototype.slideShrinkRotateTo$checkProgress = function() {
if (Math.abs(eval(“this.”+this.checkProperty)) < 0.1) {
this._parent._y = this.y;
this._parent._x = this.x;
this._parent._xscale = this._parent._yscale = this.es;
this._parent._rotation = this.er;
clearInterval(this.interval);
this.broadcastMessage(“clipIsGone”, this._parent);
this.removeMovieClip();
}
}
[/AS]
usage:
[AS]
MovieClip.slideShrinkRotateTo(newX, newY, newScale, newRotation, friction);
[/AS]
I’ve put this code in frame 1 in layer 1.
In layer 2 frame 1 I’ve made a simple square (MC) with the instance square. and I write in frame 1
[AS]
square.slideShrinkRotateTo(400, 250, 200, 0, 0);
[/AS]
Problem: Nothing happens.
What’s the problem here?
mx-guest2004

Problem is solved. It was the wrong value of speed.
mx-guest2004