if(document.childNodes){ 
  document.writeln('<style type="text/css">'); 
  document.writeln('.submenu { display: none; }'); 
  document.writeln('</style>'); 
} 
 
function switchDisplay(submenuId){ 
    if(document.childNodes){ 
    var idDisplay = document.getElementById(submenuId).style.display; 
 
    var submenus = document.getElementById("menu").getElementsByTagName("ul"); 
 
    for(i=0; i<submenus.length; i++){ 
        if(submenus[i].className=="submenu") 
            submenus[i].style.display="none"; 
    } 
 
    if (idDisplay=="block"){ 
        document.getElementById(submenuId).style.display="none"; 
        setCookie("showSub", 0, true); 
    } else { 
        document.getElementById(submenuId).style.display="block"; 
        setCookie("showSub", submenuId, false); 
    } 
    } 
} 
 
function setCookie(cookieName, cookieValue, toDelete){ 
    document.cookie = escape(cookieName) + "=" + escape(cookieValue) + ";" + ((toDelete) ? "expires=Tue, 01 Jan 1980 00:00:00 GMT;" : ""); 
} 
 
function getCookie(cookieName){ 
    var re = new RegExp(escape(cookieName)+"=([^;]+)") 
    document.cookie.match(re); 
    return (RegExp.$1) ? unescape(RegExp.$1) : false; 
} 
 
window.onload = function(){ 
    if(getCookie("showSub") && document.getElementById(getCookie("showSub"))){ 
            document.getElementById(getCookie("showSub")).style.display = "block"; 
    } 
}