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

function dd_open() {	
    dd_canceltimer();
    dd_close();
    ddmenuitem = $(this).find('ul').eq(0).css('visibility', 'visible');
}

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

function dd_timer() {	
    closetimer = window.setTimeout(dd_close, timeout);
}

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