var VideoWindow = null;

function OpenVideoWindow(url)
{
  if ((! VideoWindow) || VideoWindow.closed)
      VideoWindow = window.open (url, "video", "height=600, width=600, resizable=1, scrollbars=1, alwaysRaised=1");
   else
   {
      VideoWindow.location.href = url;
      VideoWindow.focus();
   }
}