function loadPosts(categoria, pagina) {
    
    var xmlhttp = newXMLHttpRequest();
    
    if (xmlhttp!=null) {        
        xmlhttp.open("POST","../../forum/posts.php",true);
        xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
        xmlhttp.send("categoria=" + categoria+"&page="+pagina);
        xmlhttp.onreadystatechange = handleResponse(xmlhttp, downloadQueryResult, ResponseType.html);
    } else {
        alert("Il tuo browser non supporta XMLHttpRequest")
    }
}

function downloadQueryResult(XMLResult) {
    document.getElementById('posts').innerHTML=XMLResult;
}