var timeout = 700;
var closetimer = 0;
var ddmenuitem = 0;

function jsddm_open() {
 jsddm_canceltimer();
 jsddm_close();
 ddmenuitem = $(this).find('ul').eq(0).css('visibility', 'visible');
}

function jsddm_close() {
 if (ddmenuitem) ddmenuitem.css('visibility', 'hidden'); 
}

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

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

$(document).ready(function() {
 $('.top-menu > li').bind('mouseover', jsddm_open);
 $('.top-menu > li').bind('mouseout', jsddm_timer);
});

document.onclick = jsddm_close;