function menuInit(){
    if (window.XMLHttpRequest) {
        //var elem = document.getElementById("menualert");
        //elem.innerHTML = "Microsoft Internet Explorer 7, Mozilla Firefox 3以上を推奨しています。";
        //elem.style.display = elem.style.display == "block"?"none":"block";
    }
    else {
        setDlOnMouseEvt("menu");
    }
}

function setDlOnMouseEvt(id){
    var obj = document.getElementById(id).getElementsByTagName("dl");
    for (var i = 0; i < obj.length; i++) {
        obj[i].onmouseover = function(){
            pullDown(this)
        };
        obj[i].onmouseout = function(){
            pullDown(this)
        };
    }
}

function pullDown(obj){
    for (var i = 0; i < obj.childNodes.length; i++) {
        if (obj.childNodes[i].nodeName.toLowerCase() == "dd") {
            obj.childNodes[i].style.display = obj.childNodes[i].style.display == "block" ? "none" : "block";
        }
    }
}