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

function ddm_open() {
    ddm_canceltimer();
    ddm_close();
    ddmenuitem = $(this).find('ul').css('display', 'block');
}

function ddm_close()
{ if (ddmenuitem) ddmenuitem.css('display', 'none'); }

function ddm_timer()
{ closetimer = window.setTimeout(ddm_close, timeout); }

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

$(document).ready(function() {
    $('.ddm > li').bind('mouseover', ddm_open)
    $('.ddm > li').bind('mouseout', ddm_timer)
});

document.onclick = ddm_close;