function curwin()
  {
  var w = 720;
  var h = 350;
  // initialize winX and winY to default values
  // for cases where Screen object isn't supported 
  var winX = 50;
  var winY = 50;
  var resize = "";
  var scroll = "";
  // only set new values if 4.0 browser
  if (parseInt(navigator.appVersion) >= 4)
    {
    winX = (screen.availWidth - w)*.5;
    winY = (screen.availHeight - h)*.5;
    }
  newWindow = window.open("http://www.abc-escorts.com/convert.php", "currency","titlebar=yes,location=no,resizable=yes,scrollbars=yes,width="+w+",height="+h+",left="+winX+",top="+winY);
  }