function PopupCentrata() {
  var w = 800;
  var h = 600;
  var l = Math.floor((screen.width-w)/2);
  var t = Math.floor((screen.height-h)/2);
     window.open("swf/filling/doubletank/doubletank.html","","width=" + w + ",height=" + h + ",top=" + t + ",left=" + l);
}