// part of code on next button
if (screen instanceof mx.screens.Slide)
{
screen.rootSlide.currentSlide.nextSlide.gotoAndPla y (1);
screen.rootSlide.currentSlide.gotoNextSlide();
}

// part of code on previous button
if (screen instanceof mx.screens.Slide)
{
screen.rootSlide.currentSlide.previousSlide.gotoAn dPlay (1);
screen.rootSlide.currentSlide.gotoPreviousSlide();
}