if totalFrame then gotoandStop - nextFrame

Hi everyone,

I still can't figure out my problem.
I have a movieClip called :mc_fact" and there are about 20 facts on the movieClip(mc_fact).

Frame7
I put this because this is the first fact and no prev_btn on this frame.
After this frame I put both buttons(prev_btn and next_btn)
Frame26 is the last fact so if user clicks the next_btn, then it will go to the first frame which frame7.
Here I put my AS 3 on the frame7 and 8.

FRAME7
stop();


next_btn.addEventListener(MouseEvent.CLICK, goForward);

function goBack(event:MouseEvent) {
      nextFrame();

}

function backward(event:MouseEvent) {
      prevFrame();
}

------------------------------------------------------------------------------------------------------------------------

Frame8

stop();

prev_btn.addEventListener(MouseEvent.CLICK, goForward);
next_btn.addEventListener(MouseEvent.CLICK, goForward);

function goBack(event:MouseEvent) {
      if (this.currentFrame == this.totalFrames)
      {
            gotoAndStop(7);
      }
      else
      {
            nextFrame();
      }
}

function backward(event:MouseEvent) {
      if (this.currentFrame == 1)
      {
            gotoAndStop(this.totalFrames);
      }
      else
      {
            prevFrame();
      }
}

I am attaching FLA file so please change .txt to .zip.
Thanks,
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