function show_hide(id_element) {
    var elem = document.getElementById(id_element).style;
    if (elem.display == "block") {
        elem.display = "none";
    } else {
        elem.display = "block";
    }
    document.getElementById("footer_block").style.bottom = "1px";
    document.getElementById("footer_block").style.bottom = "0px";
    return false;
}