function popup_site_evaluation(url)
{
  if (navigator.appName == "Microsoft Internet Explorer")
  {
    if ( navigator.appVersion.indexOf( "Macintosh" ) != -1 ) // IE Mac
    {
      window.open(url,'','status=yes,location=no,scrollbars=yes,toolbar=yes,menubar=no,width=600,height=500,top=0,left=0,resizable=no');
    }
    else // IE Win
    {
      window.open(url,'','status=yes,location=no,scrollbars=yes,toolbar=yes,menubar=no,width=600,height=500,top=0,left=0,resizable=no');
    }
  }
  if (navigator.appName != "Microsoft Internet Explorer")
  {
    if ( navigator.appVersion.indexOf( "Macintosh" ) != -1 ) // Netscape Mac
    {
      window.open(url,'','status=yes,location=no,scrollbars=yes,toolbar=yes,menubar=no,width=600,height=500,top=0,left=0,resizable=no');
    }
    else // Netscape WIn
    {
      window.open(url,'','status=yes,location=no,scrollbars=yes,toolbar=yes,menubar=no,width=600,height=500,top=0,left=0,resizable=no');
    }
  }
}