function openMyFlashWindow(MyURL, thisWidth, thisHeight) {
  var w = 772;
  var h = 556;
  var cw = 15;
  var ch = 45;

  if (thisWidth != null) {
    w = thisWidth;
  }

  if (thisHeight != null) {
    h = thisHeight;
  }

  if (window.screen) {
    cw = Math.floor((screen.availWidth - w) / 2);
    ch = Math.floor((screen.availHeight - h) / 2);

 window.open(MyURL, 'WinName', 'Width='+w+', Height='+h+', screenX='+cw+', screenY='+ch+', top='+ch+', left='+cw+', status=0, toolbar=0, menubar=0, scrollbar s= 0, resizable=0');
 }

  else {
    window.open(MyURL, 'WinName', 'Width=772, Height=556');
  }
}