function change_tab(element) {
    if (element.className == "tab1 active") {
        element.className = "tab1";
        document.getElementById("tabulator1_tab2").className = "tab2 active";
    }
    if (element.className == "tab1") {
        element.className = "tab1 active";
        document.getElementById("tabulator1_tab2").className = "tab2";
    }
    if (element.className == "tab2 active") {
        element.className = "tab2";
        document.getElementById("tabulator1_tab1").className = "tab1 active";
    }
    if (element.className == "tab2") {
        element.className = "tab2 active";
        document.getElementById("tabulator1_tab1").className = "tab1";
    }
    //change_tab_body(element);
}
function change_tab_body(element) {
    /* you must execute ajax method which will return return body content */
    var body_bufer;
    body_bufer = "<p>" + element.id + "</p>";
    document.getElementById("tabulator1_tab_body").innerHTML = body_bufer;
}