function CenteredPopUp( targetURL, winName, width, height, otherProps ) {
    var winX  = (screen.width  - width ) / 2;
    var winY  = (screen.height - height) / 2;
    winProps  = 'height=' + height;
    winProps += ',width=' + width ;
    winProps += ',top='   + winY  ;
    winProps += ',left='  + winX  ;
    if ( otherProps == null ) {
      winProps += ',scrollbars=yes,resizable=yes';
    } else {
      winProps += ',' + otherProps;
    }
    win = window.open( targetURL, winName, winProps )
    if (parseInt(navigator.appVersion) >= 4) {
      win.window.focus();
    }
    return win;
}

function glossaryPopUp( url ) {
  CenteredPopUp( url,'glossary',620,460,'toolbar=no,menubar=no,status=yes,scrollbars=yes,resizable=yes');
}