(function (){
    var url = escape(window.location.href);
    var size = "150x150";
    var chart = "http://chart.apis.google.com/chart?cht=qr&chl=" + url + "&chs=" + size;
    var img = document.createElement('img');
    img.setAttribute('src',chart);
    var qr_src = document.getElementById("qr_code");
    qr_src.parentNode.insertBefore(img, qr_src)
})();