怎么样通过JavaScript实现动态增加、删除表单域？
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<!-- JavaScript 实现动态增加、删除表单域 -->
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<SCRIPT LANGUAGE="JavaScript">
<!--
var i=0
function Add()
{
var temp = document.body.children.item(0).rows.item(3).cells.item(0).children.item(0).rows.item(0).cells.item(0).children.item(0).children.item(0)
temp.insertRow(temp.rows.length);
temp.rows.item(temp.rows.length -1).insertCell(0);
var xx=temp.rows.length -1 ;//-1
var sHTML
sHTML='<TABLE border=/"1/" style=/"border-collapse: collapse/" bordercolor=/"#111111/"width=/"100%/">' +
'<TR>' +
'<TD align=/"center/" colspan=/"4/">个人信息 (' + i++ +')</TR>' +
'<TR>' +
'<TD align=/"right/">姓名:</TD>' +
'<TD> <INPUT TYPE=/"text/" NAME=/"tName/"></TD>' +
'<TD align=/"right/">性别:</TD>' +
'<TD> <INPUT TYPE=/"radio/" checked NAME=/"rSex/">先生 <INPUT TYPE=/"radio/" NAME=/"rSex/">女士</TD>' +
'</TR>' +
'<TR>' +
'<TD align=/"right/">职务:</TD>' +
'<TD> <SELECT NAME=/"/">' +
'<option value=/"其它/"> 其它 </option>' +
'<option value=/"经理/"> 经理 </option>' +
'</SELECT>' +
'</TD>' +
'<TD align=/"right/">邮件:</TD>' +
'<TD> <INPUT TYPE=/"text/" NAME=/"tMail/"></TD>' +
'</TR>' +
'<TR>' +
'<TD align=/"center/" colspan=/"4/"><input type=/"button/" value=/" 删除 /" onclick=/"Delete(this);/">'
'</TR>' +
'</TABLE>';
temp.rows.item(temp.rows.length-1).cells.item(0).innerHTML=sHTML;
temp.rows.item(temp.rows.length-1).cells.item(0).children.item(0).rows.item(3).cells.item(0).children.item(0).text=xx;
}
function Delete(x)
{
var temp = document.body.children.item(0).rows.item(3).cells.item(0).children.item(0).rows.item(0).cells.item(0).children.item(0).children.item(0)
temp.deleteRow(x.text.valueOf())
for (var j=0;j<temp.rows.length;j++) temp.rows.item(j).cells.item(0).children.item(0).rows.item(3).cells.item(0).children.item(0).text=j;
}
file://-->
</SCRIPT>
</HEAD>
<BODY>
<table border="1" style="border-collapse: collapse" bordercolor="#111111" width="100%">
<tr>
<td width="100%" align="center">Register</td>
</tr>
<tr>
<td align="center">
<TABLE border="1" width="80%" style="border-collapse: collapse" bordercolor="#111111">
<TR>
<TD align="right" width="15%">公司:</TD>
<TD> <INPUT TYPE="text" NAME="tCompany" size="60">
</TD>
</TR>
<TR>
<TD align="right">地址:</TD>
<TD> <INPUT TYPE="text" NAME="tAddress" size="60">
</TD>
</TR>
<TR>
<TD align="right">电话:</TD>
<TD> <INPUT TYPE="text" NAME="tTelephone" size="30">
</TD>
</TR>
<TR>
<TD align="right">传真:</TD>
<TD> <INPUT TYPE="text" NAME="tFax" size="30">
</TD>
</TR>
</table>
</td>
</tr>
<tr>
<td align="center">
<INPUT TYPE="button" value=" 添加 " onclick="Add()">
</td>
</tr>
<tr>
<td align="center">
<TABLE align=center border=0 width="100%" height="100%">
<TR>
<TD width="100%" height="300" align="center">
<DIV style=" OVERFLOW: auto;BORDER-RIGHT: 1px solid; BORDER-TOP: 1px solid; BORDER-LEFT: 1px solid; BORDER-BOTTOM: 1px solid; WIDTH: 80%; HEIGHT: 100%">
<TABLE width="100%">
</TABLE>
</DIV>
</TD>
</TR>
</TABLE>
</td>
</tr>
<tr>
<td align="center">
<TABLE border="1" width="40%" style="border-collapse: collapse" bordercolor="#111111">
<TR>
<TD width="10%"> <INPUT TYPE="checkbox" NAME="">寄资料</TD>
</TR>
<TR>
<TD> <INPUT TYPE="checkbox" NAME="">去</TD>
</TR>
</TABLE>
</td>
</tr>
<tr>
<td align="center">
<INPUT TYPE="submit" value=" 提交 "> <INPUT TYPE="reset" value=" 清空 ">
</td>
</tr>
</table>
</BODY>
</HTML>
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