var timeout = 500;
var closetimer = 0;
var ddmenuitem = 0;

function jsddm_open() {
    jsddm_canceltimer();
    jsddm_close();
    ddmenuitem = $(this);
    ddmenuitem.addClass("current");
    ddmenuitem.find('ul').css('visibility', 'visible');
}

function jsddm_close() {
    if (ddmenuitem) {
        ddmenuitem.find('ul').css('visibility', 'hidden');
        ddmenuitem.removeClass("current");
    }
}

function jsddm_timer() {
    closetimer = window.setTimeout(jsddm_close, timeout);
}

function jsddm_canceltimer() {
    if (closetimer) {
        window.clearTimeout(closetimer);
        closetimer = null;
    }
}

function HNdropMenu() {
    document.onclick = jsddm_close;
    $("#top-nav ul ").css({ display: "block" }).css('visibility', 'hidden');
    $("#top-nav > li").bind('mouseover', jsddm_open);
    $("#top-nav > li").bind('mouseout', jsddm_timer);
}

$(document).ready(function () {
    HNdropMenu();
});