Hello, I want to include this Javascript to my side, but i'dont understand the gantry documentation to do this right.
Can you explain it to me:

$(function(){

    

    var pagePositon = 0,

        sectionsSeclector = 'section',

        $scrollItems = $(sectionsSeclector),

        offsetTolorence = 30,

        pageMaxPosition = $scrollItems.length - 1;

    

    //Map the sections:

    $scrollItems.each(function(index,ele) { $(ele).attr("debog",index).data("pos",index); });



    // Bind to scroll

    $(window).bind('scroll',upPos);

    

    //Move on click:

    $('#arrow a').click(function(e){

        if ($(this).hasClass('next') && pagePositon+1 = 0) {

            pagePositon--;

            $('html, body').stop().animate({ 

                  scrollTop: $scrollItems.eq(pagePositon).offset().top

              }, 300);

            return false;

        }

    });

    

    //Update position func:

    function upPos(){

       var fromTop = $(this).scrollTop();

       var $cur = null;

        $scrollItems.each(function(index,ele){

            if ($(ele).offset().top