function popUp(url,name,param) 
{
  var popUp;

  popUp=window.open(url,name,param);
  if (popUp==null) 
  {
    return null;
  }
  else
  {
    popUp.focus();
    return popUp;
  }  
}

function OpenCredits(url, target)
{

  leftVal = (screen.width - 365) / 2;
  topVal = (screen.height - 270) / 2;

  popUp(url, target, "width=365,height=270,left=" + leftVal +
                     ",top=" + topVal + ",scrollbars=no,resizable=no,status=no");
  
  return false;
}