// JavaScript Document

 <!--
 function chat() {
   var w = 300;
   var h = 458;
   var l = Math.floor((screen.width-w)/2);
   var t = Math.floor((screen.height-h)/2);
      window.open("pop_chat.html","","width=" + w + ",height=" + h + ",top=" + t + ",left=" + l);
 }

 function mappa() {
   var w = 400;
   var h = 486;
   var l = Math.floor((screen.width-w)/2);
   var t = Math.floor((screen.height-h)/2);
      window.open("mappa.html","","width=" + w + ",height=" + h + ",top=" + t + ",left=" + l);
 }