var scrolling = null;
  
     function scroll_left() {
         var d = document.getElementById('browser');
 
         d.scrollLeft = d.scrollLeft - 4;
  
         scrolling = window.setTimeout(function() {
             scroll_left();
         }, 1);
     }
  
     function scroll_right() {
         var d = document.getElementById('browser');

         d.scrollLeft = d.scrollLeft + 4;
  
         scrolling = window.setTimeout(function() {
             scroll_right();
         }, 1);
     }
  
     function stop_scroll() {
         window.clearTimeout(scrolling);
     }