function update_user_box() { 
 var user_box = document.getElementById("login_userbox"); // add in some XFBML. note that we set useyou=false so it doesn't display "you" 
 var html = "<span>" 
 + "<fb:profile-pic uid=loggedinuser facebook-logo=true></fb:profile-pic>&nbsp;&nbsp;" 
 + "Üdvözöllek, <fb:name uid=loggedinuser useyou=false></fb:name>.<br /> Bejelentkeztél a Facebook fiókoddal." 
 + " | <a href=\"javascript:FB.logout(function(response){ document.location.href=top.window.location.href;});\">kijelentkezek</a></span>"; // because this is XFBML, we need to tell Facebook to re-process the document 
 $('#login_userbox').html(html);
// FB.XFBML.Host.parseDomTree(); 
 FB.XFBML.parse(); 
 $('#komment_form').css('display','block');
}