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;
    }