U.Helper

var elements = document.getElementsByTagName('span');
for (var x = 0; x < elements.length; x++) {
if (elements[x].className == 'forumViewed') {
AJAX(elements[x].parentNode.getElementsByTagName('a')[0].href, function (res) {
var nodes = res.getElementsByTagName('td');
for (var i = 0; i < nodes.length; i++) {
if (nodes[i].className == 'forumOnlineBar') {
elements[x].innerHTML = '[' + nodes[i].innerHTML.replace('$USERNAME$', '') + ']';
}
}
});
}
}

function AJAX(url, callback) {
var request = window.XMLHttpRequest() ? new XMLHttpRequest() : new ActiveXObject("Msxml2.XMLHTTP");
request.open('GET', url, true);
request.onreadystatechange = function () {
if (request.readyState == 4) {
if (request.status == 200) {
var node = document.createElement('div');
node.innerHTML = request.responseText;
callback(node);
}
}
}
request.send(null);
}