moving object smoothly by pressing button


I have a menu bar with three buttons and an object(movie clip) above them.
What I want is:
  1. by pressing the button the object to move and stay above the pressed button.
  2.when roll-over a button the object moves smoothly above it. Like tweening.

What I did was I change the _x coordinate but it goes very quickly.

Thanks in advance!
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mihaylinaAuthor Commented:

Thanks for sending me this solution. I still have a question: I can sort of gigure out your idea but I can't find where the following properties are defined: startx, endx, rames?

this is the script assigned to the moving rectangle:

      this.startx = this.endx = this._x;
      this.frames = 5;
      // this is the decelerated motum formula
      this._x += (this.endx - this._x) / this.frames;

buttons change this variables with:

      this._parent.moving.endx = this._x;
      this._parent.moving.endx = this._parent.moving.startx;
      this._parent.moving.endx = this._parent.moving.startx = this._x;
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mihaylinaAuthor Commented:

Now I am trying to add a scroll bar down but it doesn't appear. When I create a new document everything is fine. But with the one with your code I cannot see the scroll bar. What is the problem? Thanks
What kind of scrollbar?
mihaylinaAuthor Commented:
I found the problem.
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