var str = "";

str += "<table border='1'><tr>";
str += "<td class='tdNaglowek' colspan='7'>";
str += "<span class='clickable' onclick='wyświetlKalendarz(";
str += rok + "," + (miesiac - 2) + "," + dzienMiesiaca + ",\"";
str += el + "\");'>&lt;&lt;<\/span>&nbsp;&nbsp;";
str += nazwaMiesiaca + " " + rok + "&nbsp;&nbsp;";
str += "<span class='clickable' onclick='wyświetlKalendarz(";
str += rok + "," + (miesiac) + "," + dzienMiesiaca + ",\"";
str += el + "\");'>&gt;&gt;<\/span>";
str += "<\/td><\/tr>";