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 Popcartina() {
var w = 800;
var h = 469;
var l = Math.floor((screen.width-w)/2);
var t = Math.floor((screen.height-h)/2);
window.open ("pop/cartina.html","","width=" + w + ",height=" + h + ",top=" + t + ",left=" + l);
}

function Popcondizioni() {
var w = 400;
var h = 400;
var l = Math.floor((screen.width-w)/2);
var t = Math.floor((screen.height-h)/2);
window.open ("pop/condizioni.html","","width=" + w + ",height=" + h + ",top=" + t + ",left=" + l);
}