$(document).ready(function(){
    $('input#surnameContactField').click(function(){
        if($('input#surnameContactField').val() == "Podaj nazwisko"){
            $('input#surnameContactField').val('');
        }
    });

    $('input#phoneContactField').click(function(){
        if($('input#phoneContactField').val() == "Podaj numer telefonu"){
            $('input#phoneContactField').val('');
        }
    });
});