When jump next page previous page if use Middle Mouse Button/Wheel. It's possible...??

It is best to remove the eventListener when leaving the slide, because when revisiting the slide it will run a new eventListener so the variable will be updated from both listeners. Here is a solution:

var player=GetPlayer();

var scrollCount = player.GetVar("scroll", scrollCount);

function scrollCounter(e){
if(e.wheelDelta<0 && scrollCount<59){
scrollCount++;
}

else if(e.wheelDelta>0 && scrollCount>0){
scrollCount--;
}

else if(scrollCount == 59){
window.removeEventListener('mousewheel', scrollCounter);
}

player.SetVar("scroll",scrollCount);

}

window.addEventListener('mousewheel', scrollCounter);

It's possible to remove the listener with the next button or any other.