function bodyHeight()
 {
   var pageHeight;
   
   if(window.innerHeight && window.scrollMaxY)
    {
     oh = document.getElementById('point1').offsetHeight;
     pageHeight = window.innerHeight + window.scrollMaxY;
     document.getElementById('point1').style.top = pageHeight - oh + 'px';
    }
   else if(document.body.scrollHeight > document.body.offsetHeight)
    {
     oh = document.getElementById('point1').offsetHeight;
     pageHeight = document.body.scrollHeight;
     document.getElementById('point1').style.top = pageHeight - oh + 'px';
    }
   else
    {
     oh = document.getElementById("point1").offsetHeight + 4;
     pageHeight = document.body.offsetHeight + document.body.offsetTop;
     document.getElementById('point1').style.top = pageHeight - oh + 'px';
    }
}