求js大神帮忙看看下面的代码哪儿有错，运行不对啊。

function clockon(bgclock){
   var now=new Date();
   var year=now.getYear();
   var month=now.getMonth();
   var date=now.getDate();
   var day=now.getDay();
   var hour=now.getHours();
   var minu=now.getMinutes();
   var sec=now.getSeconds();
   var week;
   month=month+1;
   if(month<10) month="0"+month;
   if(date<10) date="0"+date;
   if(hour<10) hour="0"+hour;
   if(minu<10) minu="0"+minu;
   if(sec<10) sec="0"+sec;
   var arr_week=new Array("星期日","星期一","星期二","星期三","星期四","星期五","星期六");
   week=arr_week[day];
   var time="";
   time=year+"年"+month+"月"+date+"日 "+week+" "+hour+":"+minu+":"+sec;
   bgclock.innerHTML="系统公告：["+time+"]"
   var timer=setTimeout("clockon(bgclock)",200);
}