window.onload=function(){
   var hgt = document.getElementById('page1').offsetHeight;
  //alert(hgt);
  if (hgt < 280)
  {
    document.getElementById('scroll_up').style.visibility='hidden';
    document.getElementById('scroll_down').style.visibility='hidden';
    document.getElementById('page1').style.visibility='visible';
  }
  else
  {
      document.getElementById('scroll_up').style.visibility='visible';
      document.getElementById('scroll_down').style.visibility='visible';
      document.getElementById('page1').style.visibility='hidden';
  }
   ScrollPageInit();
       }