function setTab(m, n) {
    var menu = document.getElementById("tab" + m).getElementsByTagName("li");
    var showdiv = document.getElementById("tablist" + m).getElementsByTagName("div");
    for (i = 0; i < menu.length; i++) {
        menu[i].className = i == n ? "now" : "";
        showdiv[i].style.display = i == n ? "block" : "none";
    }
}