// JavaScript Document

     var scrolling = null;
 
     function scroll_up() {
         var d = document.getElementById('scroll');
  
         d.scrollTop = d.scrollTop - 3;
  
         scrolling = window.setTimeout(function() {
             scroll_up();
         }, 25);
     }
  
     function scroll_down() {
         var d = document.getElementById('scroll');
 
         d.scrollTop = d.scrollTop + 3;
  
         scrolling = window.setTimeout(function() {
             scroll_down();
         }, 25);
     }
  
     function stop_scroll() {
         window.clearTimeout(scrolling);
     }