function Popcredits() {
var w = 300;
var h = 220;
var l = Math.floor((screen.width-w)/2);
var t = Math.floor((screen.height-h)/2);
window.open ("pop/credits.html","","width=" + w + ",height=" + h + ",top=" + t + ",left=" + l);
}

function Poplinks() {
var w = 300;
var h = 200;
var l = Math.floor((screen.width-w)/2);
var t = Math.floor((screen.height-h)/2);
window.open ("pop/links.html","","width=" + w + ",height=" + h + ",top=" + t + ",left=" + l);
}

function Popcertificazioni() {
var w = 300;
var h = 273;
var l = Math.floor((screen.width-w)/2);
var t = Math.floor((screen.height-h)/2);
window.open ("pop/certificazioni.html","","width=" + w + ",height=" + h + ",top=" + t + ",left=" + l);
}

function Popprivacy() {
var w = 550;
var h = 521;
var l = Math.floor((screen.width-w)/2);
var t = Math.floor((screen.height-h)/2);
window.open ("pop/privacy.html","","width=" + w + ",height=" + h + ",top=" + t + ",left=" + l);
}