var is_clicked = 0;
function show_sub_menu(div) {
    document.getElementById(div).style.visibility = 'visible';
}

function fix_sub_menu(div) {
    is_clicked = 1;
    //document.getElementById(div).innerHTML ="";
    document.getElementById(div).style.visibility = 'visible';
    $(".li_parent a").css("color", "#fff");
    $("#li_tuning a").css("color", "#0086FF");
    $("#li_tuning a").css("font-size", "12px");
}

function hide_sub_menu(div) {
    if (is_clicked == 0) {
        //document.getElementById('sub_menu').innerHTML ="";
        document.getElementById(div).style.visibility = 'hidden';
    }
}