[Javascript] Timer

/*
Made By Seven ([email protected])
*/
    var montharray=new Array("Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec")

    function countdown(yr,m,d,divid)
    {
        theyear=yr;themonth=m;theday=d;div=divid;
        var today = new Date();
        var todayy=today.getFullYear();
        var todaym=today.getMonth();
        var todayd=today.getDate();
        var todayh=today.getHours();
        var todaymin=today.getMinutes();
        var todaysec=today.getSeconds();
        var todaystring=montharray[todaym]+" "+todayd+", "+todayy+" "+todayh+":"+todaymin+":"+todaysec;
        futurestring=montharray[m-1]+" "+d+", "+yr
        dd=Date.parse(futurestring)-Date.parse(todaystring)
        dday=Math.floor(dd/(60*60*1000*24)*1);
        dhour=Math.floor((dd%(60*60*1000*24))/(60*60*1000)*1);
        dmin=Math.floor(((dd%(60*60*1000*24))%(60*60*1000))/(60*1000)*1);
        dsec=Math.floor((((dd%(60*60*1000*24))%(60*60*1000))%(60*1000))/1000*1);
        setTimeout("countdown(theyear, themonth, theday, div);",1000);
        if(dday<=-1)
        {
            div.innerHTML = "날짜가 지나 사용할 수 없습니다.";
        }
        else
        {
            div.innerHTML = dday+ "일 "+dhour+"시간 "+dmin+"분  "+dsec+"초 남았습니다";
        }
        return;
    }