De la ayuda de Flash:
Código :
mcQueUtilizaElNuevoCursor.onRollOver = function() {
Mouse.hide();
this.attachMovie("mcFormaDelCursor", "nuevaFormaDelCursor", this.getNextHighestDepth(), {_x:this._xmouse, _y:this._ymouse});
};
mcQueUtilizaElNuevoCursor.onMouseMove = function() {
this.nuevaFormaDelCursor._x = this._xmouse;
this.nuevaFormaDelCursor._y = this._ymouse;
};
mcQueUtilizaElNuevoCursor.onRollOut = function() {
Mouse.show();
this.nuevaFormaDelCursor.removeMovieClip();
};