function(
  l, // link node
  i  // placeholder for image
){
  // add newly created image i (currently without source) to link
  l.appendChild( 
    i=new Image()
  );
  // set image source to use the google chart api to create the QR-Code
  i.src='//chart.apis.google.com/chart?cht=qr&chs=99x99&chld=M|0&chl='+l.href;
}