function slide(){
	if (sp.forward === true) {
            if (sp.getCurrentPanel() === sp.showNextPanel()) {
                sp.showPreviousPanel();
                sp.forward = false;
            }
        } else {
            if (!sp.showPreviousPanel()) {
                sp.showNextPanel();
                sp.forward = true;
            }
        }
}
var slideShow;
function startSlideshow(){
	slideShow = setInterval(slide,5000);
}
function stopSlideshow(){
	if(slideShow) {
	clearInterval(slideShow);
	delete slideShow;
	}
}
window.onload = startSlideshow;