A simple autoscroller

auto_scroll.js

var interval = setInterval(function() {
  if (document.body.scrollTop < (scrollBy(0,1),document.body.scrollTop)) { //test if body can be scrolled, tweak the number to change scroll speed
    //Do whatever
  } else {
    clearInterval(interval); //stop scrolling
    //jQuery("#nextNav").parent()[0].click();
  }
}, 10);// Tweak that number to change scroll speed