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

function jsddm_open(){
	jsddm_canceltimer();
	jsddm_close();
	ddmenuitem = $(this).find('ul').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(){
	$('#nav-tree > li').bind('mouseover', jsddm_open)
	$('#nav-tree > li').bind('mouseout',  jsddm_timer)
});

document.onclick = jsddm_close;