function OpenCenteredPopup(url, name, Width, Height, Scrollbars)
{
    var winLeftPos = (screen.width - Width) / 2;
    var winTopPos = (screen.height - Height) / 2;
    
    var win = window.open(url, name, 'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars='+Scrollbars+',resizable=no,copyhistory=yes,width='+Width+',height='+Height+',left='+winLeftPos+', top='+winTopPos+',screenX='+winLeftPos+',screenY='+winTopPos+'');
    
    if (win != null)
    {
        win.resizeTo(Width, Height);
        win.moveTo(winLeftPos, winTopPos);
        win.focus();
    }
}