if (navigator.appName == 'Netscape')
{
    var ekran_bpp = screen.pixelDepth
}
else
{
    var ekran_bpp = screen.colorDepth
}
document.write('<div style = "position: absolute; visibility: hidden;"><img src = "./admin/licznik_dopisz.php?ekran_bpp=' + ekran_bpp + '&ekran_res=' + screen.width + 'x' + screen.height + '&dokument_wskazujacy=' + document.referrer + '&refresh=' + Math.random() + ' width = 0px height = 0px border = 0px" /></div>');