var referrer = window.location.href;
var transcoder = 'http://www.google.com/gwt/n?u=';
var chartServer = 'http://chart.apis.google.com/chart?chs=150x150&cht=qr&choe=UTF-8&chl=';

var url = transcoder + encodeURIComponent(referrer);
url = chartServer + encodeURIComponent(url);

var img = document.createElement('img');
img.width = 150;
img.height = 150;
img.src = url;
img.alt = 'See this on your phone';

var container = document.createElement('div');
container.appendChild(img);
document.write(container.innerHTML);