JS 获取时间 之后加入 文本框中？

<%@ page language="java" import="java.util.*,java.text.*" pageEncoding="utf-8"%>
<html >
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>采购入库</title>
</head>
<script type="text/javascript" language="javascript">
function clockon(bgclock){
    var now=new Date();
    var year=now.getYear();
    var month=now.getMonth();
    var date=now.getDate();
    var hour=now.getHours();
    var minu=now.getMinutes();
    var sec=now.getSeconds();
    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 time="";
    time="pt"+year+month+date+hour+minu+sec;


   if(document.all){      bgclock.innerHTML="pt"+time   }
    document.getElementById("bgclock").value=time;
    
}
</script>
<body onLoad="clockon(bgclock)"><table width="100%" border="1">
  <tr>
    <td>
    <form  action="" method="post">
    <table width="100%" border="1">
      <tr>
        <th colspan="4" align="left" scope="col">采购入库单</th>
        </tr>
      <tr>
        <td width="9%">入库单号</td>
        <td width="19%" ><input type="text" name="purchasingThe.imptGrnnumber" id="bgclock"  /></td>
        <td width="14%">采购批次</td>
        <td width="58%"><input type="text" name="purchasingThe.imptPurchaseBatch" id="purchasingThe.imptPurchaseBatch" /></td>
      </tr>
      <tr>
        <td>备注</td>
        <td colspan="3"><textarea name="purchasingThe.imptNote" id="purchasingThe.imptNote" cols="70" rows="5"></textarea></td>
        </tr>
    </table></form>这样写 取不到值啊  但是 id写在TD中就可以取到值 那样我就无法就如数据库了  求解决...