Ява Часы на сайт

<div><center><span id="hours"></span></center></div>
 
<script type="text/javascript">
obj_hours=document.getElementById("hours");
function wr_hours()
{
time=new Date();
time_sec=time.getSeconds();
time_min=time.getMinutes();
time_hours=time.getHours();
time_wr=((time_hours<10)?"0":"")+time_hours;
time_wr+=":";
time_wr+=((time_min<10)?"0":"")+time_min;
time_wr+=":";
time_wr+=((time_sec<10)?"0":"")+time_sec;
time_wr=""+time_wr;
obj_hours.innerHTML=time_wr;
}
wr_hours();
setInterval("wr_hours();",1000);
</script>