function PopupCentrata(file) {
   x = file
   var w = 300;
   var h = 200;
   var l = Math.floor((screen.width-w)/2);
   var t = Math.floor((screen.height-h)/2);
      window.open(x,"","width=" + w + ",height=" + h + ",top=" + t + ",left=" + l +",scrollbars=1");
 }