Page Swiping

gestureZone.addEventListener('touchstart', function(event) {
    touchstartX = event.changedTouches[0].screenX;
}, false);
gestureZone.addEventListener('touchend', function(event) {
    touchendX = event.changedTouches[0].screenX;
    handleGesture();
}, false); 
function handleGesture() {
    if (touchendX < touchstartX && Math.abs(touchendX - touchstartX) > 150) {
        window.location.replace(prev.href)
    }
    if (touchendX > touchstartX && Math.abs(touchendX - touchstartX) > 150) {
        window.location.replace(next.href)
    }
}