function zoomimg(src, id) {
  var zoomdiv  = document.getElementById('zoomdiv');
  var caption = "";
  src = src.replace("/medium_", "/big_");
    
  zoomdiv.innerHTML="<table style='height:100%;width:100%;vertical-align:center;'><tr style='vertical-align: center;'><td style='text-align:center;vertical-align: center;'><img src='"+src+"' /></td></tr></table>";

  var byBody = false;
  var scrollAmt = 138;
  try {
    var body =document.body;  

    if(body.scrollTop > 138) { 
      scrollAmt += body.scrollTop; 
      byBody = true;
    }
  } catch(e) {}

  try {
    var docElement = document.documentElement;

    if(docElement.scrollTop > 138) { 
      if (!byBody) scrollAmt += docElement.scrollTop;
    }
  } catch(e) {}

  zoomdiv.style.top = scrollAmt + 'px';
  zoomdiv.style.visibility = 'visible';

}