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(){  
    $('#jsddm > li').bind('mouseover', jsddm_open);
    $('#jsddm > li').bind('mouseout',  jsddm_timer);
});

document.onclick = jsddm_close;