You probably didn't get any responses since this thread was posted when most of the members are asleep.

To make a movieclip do something when you click it, you need to add an event listener for MouseEvent.click to it.

If you next button has the instancename "nextButton", and the next slide frame has the label "nextSlideLabel" then this code will make your movie advance when you click the button.

Code:
nextButton.addEventListener(MouseEvent.CLICK, goForward);

function goForward(e:MouseEvent):void{
  gotoAndStop("nextSlideLabel");
}
To go backward, if your previous slideLabel was "prevSlide", then just use that as the argument to gotoAndStop.