// JavaScript Document
 function popup(pagina) {
	var stili = 'resizable=no, fullscreen=no, menubar=no, toolbar=no, location=no, scrollbars=no, status=no';
   	var w = 640;
   	var h = 250;
   	var l = Math.floor((screen.width-w)/2);
   	var t = Math.floor((screen.height-h)/2);
    window.open(pagina,"","width=" + w + ",height=" + h + ",top=" + t + ",left=" + l, stili); 
	}