function SendMessage(threadID, forumID, text, callback) {
    var xhr = new XMLHttpRequest();
    xhr.open("POST", ipb.vars['base_url'] + 'app=forums&module=ajax&section=topics&do=reply&t=' +threadID + '&f=' + forumID, true);
    xhr.setRequestHeader("X-Requested-With", "XMLHttpRequest");
    xhr.setRequestHeader("X-Prototype-Version", "1.7.1");
    xhr.setRequestHeader("Accept", "text/javascript, text/html, application/xml, text/xml, */*");
    xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded; charset=UTF-8");
    xhr.send("md5check=" + ipb.vars['secure_hash'] + "&Post=" + text + "&isRte=0&noSmilies=0");
    xhr.onreadystatechange = function () {
        if (xhr.readyState == 4) callback && callback(xhr.responseText);
    };
}