theMonth = theMonth+1

if ( theMonth == "1") theMonth = "Styczeń";
if ( theMonth == "2") theMonth = "Luty";
if ( theMonth == "3") theMonth = "Marzec";
if ( theMonth == "4") theMonth = "Kwiecień";
if ( theMonth == "5") theMonth = "Maj";
if ( theMonth == "6") theMonth = "Czerwiec";
if ( theMonth == "7") theMonth = "Lipiec";
if ( theMonth == "8") theMonth = "Sierpień";
if ( theMonth == "9") theMonth = "Wrzesień";
if ( theMonth == "10") theMonth = "Październik";
if ( theMonth == "11") theMonth = "Listopad";
if ( theMonth == "12") theMonth = "Grudzień";

document.write( "Dzisiaj jest: " + theDay + " " + theMonth );