//POPUP
function PopupCentrata(pagina,w,h) {
   //width e height
   //var w = 600;
   //var h = 450;
   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);
}