在网页中怎样实现向下填充的功能。高分求救

在输入框的onfocus事件中记录此输入框<input type="text" onfocus="window.inputObj = this'">这样，点击按钮时就可以从全局变量window.inputObj中去到了，记得使用完把window.inputObj = null;

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<META http-equiv="Content-Type" content="text/html; charset=gb2312">
<STYLE>
input{width:70px; border:1px solid black;}
</STYLE>
<BODY>
<TABLE width="70%" id="fillTable" bordercolor="#CCCCCC"  border="1" cellspacing="0" cellpadding="0">
  <TR>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
  </TR>
  <TR>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
  </TR>
  <TR>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
  </TR>
  <TR>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
  </TR>
  <TR>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
    <TD><INPUT onFocus="window.inputObj = this"/></TD>
  </TR>
</TABLE><p>
<INPUT type="button" value="向下填充" onClick="fill()" >
<script language="javascript">
function fill()
{
    if(!window.inputObj)
    return;
    var oTable = document.all.fillTable;
var oTdIndex = window.inputObj.parentNode.cellIndex;
for(var i=0; i<oTable.rows.length; i++)
{
        for(var j=0; j<oTable.rows[i].cells.length; j++)
        {
            if(j == oTdIndex)
    oTable.rows[i].cells[j].children[0].value = window.inputObj.value;
        }
}
}
</script>
</BODY>