function menuShowHide(id, button,pfix_close,pfix_open) {
    var disp = document.getElementById(id).style.display;
    if(disp == "block") {
        document.getElementById(id).style.display = "none";
        document.getElementById(button).src = pfix_close;
        document.getElementById(button).value = pfix_close;
    }
    else {
        document.getElementById(id).style.display = "block";
        document.getElementById(button).src = pfix_open;
        document.getElementById(button).value = pfix_open;
    }
    return false;
}