var timeout         = 500;
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(){
    $('#nav > li').bind('mouseover', jsddm_open)
    $('#nav > li').bind('mouseout',  jsddm_timer)
    });
document.onclick = jsddm_close;