var timer_id;
function scroll_iframe(frm,inc,dir) 
{
  if (timer_id) clearTimeout(timer_id);
  if (window.frames[frm]) 
  {
    if (dir == "v") 
      window.frames[frm].scrollBy(0, inc);
    else 
      window.frames[frm].scrollBy(inc, 0);
      
    timer_id = setTimeout("scroll_iframe('" + frm + "'," + inc + ",'" + dir + "')", 20);
  }
}

function stopScroll() 
{ 
  if (timer_id) 
    clearTimeout(timer_id); 
}