var currentTag = 1;
function fivetag(obj, id, id_start, id_end, uiID) {
    selectMenu(obj, uiID);
    for (var i = id_start, j; i <= id_end; i++) {
        j = document.getElementById("tag_content_" + i);
        j.style.display = "none";
    }
    document.getElementById("tag_content_" + id).style.display = "block";
    currentTag++;
    if (currentTag > 5)
        currentTag = 1;
}
function selectMenu(obj, id) {
    var lia = document.getElementById(id).getElementsByTagName("li");
    var lialen = lia.length;
    for (i = 0; i < lialen; i++) {
        if (lia[i].getElementsByTagName("a")[0].className == "curMenu")
            lia[i].getElementsByTagName("a")[0].className = "";
    }
    obj.className = "curMenu";
}



function init() {
    var menulist = document.getElementById("menulist");
    setInterval('fivetag(menulist.getElementsByTagName("li")[currentTag-1].getElementsByTagName("a")[0],currentTag)', 15000);
}