Cannon that shoots

//place this code on the bullet
onClipEvent (load) {
     this._visible = 0;
     if (_root.fire == 1) {
          this._x = _root.cannon._x;
          this._y = _root.cannon._y;
     }
}
onClipEvent (enterFrame) {
     if (this != _level0.bullet) {
          if (_root.fire == 1) {
               this._y -= 5;
               this._visible = 1;
          }
          if (this._y<0) {
               this.removeMovieClip();
          }
     }
}
//place this code on the cannon
on (release) {
     _root.fire = 1;
     _root.i += 1;
     duplicateMovieClip(_root.bullet, "bullet"+i, i);
}
//place this code on "Base"
//this clip is used to turn 
//the cursur into the cannon
onClipEvent (load) {
     this._visible = 0;
     Mouse.hide();
}
onClipEvent (enterFrame) {
     _root.cannon._x = _root._xmouse;
     _root.cannon._y = _root._ymouse;
}