页面显示一直在走的时间

<div id="Time">
       <%=System.DateTime.Now.Year %>年<%=System.DateTime.Now.Month %>月<%=System.DateTime.Now.Day %>日&nbsp;&nbsp;<span id="hour"><%=System.DateTime.Now.Hour.ToString("00")%></span>:<span id="minute"><%=System.DateTime.Now.Minute.ToString("00") %></span>:<span id="second"><%=System.DateTime.Now.Second.ToString("00")%></span> (<%=System.DateTime.Now.DayOfWeek %>)
    </div>

<script type="text/javascript">
    <!--
        function OATime()
        {
            var hour = document.getElementById("hour").innerHTML;
            var minute = document.getElementById("minute").innerHTML;
            var second = document.getElementById("second").innerHTML;
           
            second++;
           
            if(second == 60)
            {
                minute++;
                second = 0;
               
                if(minute < 10)
                {        
                    document.getElementById("minute").innerHTML = '0' + minute;
                }
                else
                {
                    document.getElementById("minute").innerHTML = minute;
                }
            }
            if(minute == 60)
            {
                hour++;
                minute = 0;
               
                if(minute < 10)
                {        
                    document.getElementById("minute").innerHTML = '0' + minute;
                }
                else
                {
                    document.getElementById("minute").innerHTML = minute;
                }
               
                if(hour < 10)
                {        
                    document.getElementById("hour").innerHTML = '0' + hour;
                }
                else
                {
                    document.getElementById("hour").innerHTML = hour;
                }
            }
           
            if(second < 10)
            {        
                document.getElementById("second").innerHTML = '0' + second;
            }
            else
            {
                document.getElementById("second").innerHTML = second;
            }
           
        }
    //-->
    </script>


调用：
<script type="text/javascript">
        setInterval("OATime();",1000);
    </script>