function update_user_box() {

  var user_box = document.getElementById("user");

  // add in some XFBML. note that we set useyou=false so it doesn't display "you"
  user_box.innerHTML =
      "<span class='largefont'>"
    + "<fb:profile-pic uid='loggedinuser' facebook-logo='true'></fb:profile-pic>"
    + "<span class='largefont2'>Welcome</span> <fb:name uid='loggedinuser' useyou='false'></fb:name>"
    + "</span>";

  // because this is XFBML, we need to tell Facebook to re-process the document 
  FB.XFBML.Host.parseDomTree();
}