function PopupCentrata() {
   var w = 757;
   var h = 438;
   var l = Math.floor((screen.width-w)/2);
   var t = Math.floor((screen.height-h)/2);
      window.open("disclaimer.htm","","width=" + w + ",height=" + h + ",top=" + t + ",left=" + l);
 }
 function PopupCentrata2() {
   var w = 757;
   var h = 438;
   var l = Math.floor((screen.width-w)/2);
   var t = Math.floor((screen.height-h)/2);
      window.open("credits.htm","","width=" + w + ",height=" + h + ",top=" + t + ",left=" + l);
 }