求助 为什么 这个javascript不执行
程序代码：<!--#include file="inc/conn.asp"-->
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<link href="style/css.css" type="text/css">
<title>无标题文档</title>
<style type="text/css">
body{ text-decoration:none; margin:auto; padding-top:0; margin-top:0;}
.td{ color:#666666;text-align:left; text-decoration:none;font-size: 14px;
}
.to{font:'宋体'; font-size:13px; text-decoration:none; color:#000000;}
.tou{text-decoration:none; color:#000000;}
.midd{ margin:0 auto; text-align:center; width:1000px;}
</style>
<script language="javascript">
function checkform()
{
if (form.name.value =="" ){
alert("昵称不能为空");
return(false);
}
if (form.email.value =="" ){
alert("电子邮件不能为空");
return(false);
}
if (form.content.value =="" ){
alert("留言内容不能为空");
return(false);
}
}
</script>
</head>
<body >
<table id="__01" width="1000" border="0" cellpadding="0" cellspacing="0" align="center">
<tr>
<td colspan="5">
<img src="images/index_01.gif" width="1000" height="31" alt=""></td>
</tr>
<tr>
<td colspan="5" background="images/index_02.gif" width="1000" height="34" class="to" >
<table width="680" height="34" align="right">
<tr><td width="82"><a href="index.asp" class="tou">首页</a></td>
<td width="104"><a href="#" class="tou">公司简介</a> </td>
<td width="96"><a href="news_list.asp" class="tou">新闻中心</a></td>
<td width="99"><a href="#" class="tou">产品中心</a> </td>
<td width="113"><a href="#" class="tou">招聘向导</a> </td>
<td width="110"><a href="content.asp" class="tou">联系我们</a></td>
<td width="39"></td>
<td width="21"></td>
</tr>
</table></td>
</tr>
<tr>
<td colspan="5">
<img src="images/index_03.gif" width="1000" height="33" alt=""></td>
</tr>
<tr>
<td colspan="2">
<img src="images/news1_04.gif" width="1000" height="37" alt=""></td>
</tr>
<tr>
<td colspan="2">
<img src="images/news1_05.gif" width="1000" height="45" alt=""></td>
</tr>
<tr>
<td colspan="2">
<img src="images/news1_06.gif" width="1000" height="39" alt=""></td>
</tr>
<tr>
<td colspan="2">
<img src="images/news1_07.gif" width="1000" height="44" alt=""></td>
</tr>
<tr>
<td colspan="2">
<img src="images/news1_08.gif" width="1000" height="38" alt=""></td>
</tr>
<tr>
<td colspan="2">
<img src="images/news1_09.gif" width="1000" height="36" alt=""></td>
</tr>
<tr>
<td colspan="2">
<img src="images/news1_10.gif" width="1000" height="34" alt=""></td>
</tr>
<tr>
<td colspan="2">
<img src="images/news1_11.gif" width="1000" height="31" alt=""></td>
</tr>
</table>
<table id="__01" border="0" cellpadding="0" height="500" cellspacing="0" width="859" align="center" >
<tr>
<td valign="top" width="300"><img src="images/news_13_02.gif" border="0"></td><td width="559" valign="top">
<form name="from" id="from" action="content.asp?action=add" method="post" onSubmit="return checkform()" >
<table width="100%" height="300" border="0" cellpadding="0" cellspacing="0">
<tr>
<td width="19%"><strong>联系方式：</strong></td>
<td width="81%"> </td>
</tr>
<tr>
<td> </td>
<td> </td>
</tr>
<tr>
<td> </td>
<td> </td>
</tr>
<tr>
<td><strong>给我留言</strong></td>
<td> </td>
</tr>
<tr>
<td> </td>
<td> </td>
</tr>
<tr>
<td> </td>
<td> </td>
</tr>
<tr>
<td align="right">昵称：</td>
<td>
<input type="text" name="name"> </td>
</tr>
<tr>
<td align="right">性别：</td>
<td>
<input name="sex" type="radio" value="先生" checked="checked">
先生
<input type="radio" name="sex" value="女士">女士 </td>
</tr>
<tr>
<td align="right">E-mail:</td>
<td>
<input type="text" name="email" onblur=email(this.value)> </td>
</tr>
<tr>
<td align="right" valign="top">内容:</td>
<td><textarea name="content" cols="30" rows="5" ></textarea></td>
</tr>
<tr>
<td height="37" align="center"> </td>
<td><input type="submit" name="Submit" value=" 添 加 " border="0" style="background-color: #cccccc" />
<input name="Submit2" type="reset" value=" 重 置 " border="0" style="background-color: #cccccc" /></td>
</tr>
</table>
</form>
</td>
</tr>
</table>
<table width="1000" align="center" cellpadding="0" cellspacing="0">
<tr>
<td>
<img src="images/news1_15.gif" width="1000" alt="" border="0"></td>
</tr>
<tr>
<td >
<img src="images/news1_16.gif" width="1000" alt="" border="0"></td>
</tr>
</table>
<%
dim rs,sql
if request("action")="add" then
set rs=server.createobject("adodb.recordset")
sql="select * from Guest"
rs.open sql,conn,1,3
if request.Form("name")<>"" and request.Form("content") <>"" then
rs.addnew
rs("name")=request.Form("name")
rs("sex")=request.Form("sex")
rs("content")=request.Form("content")
rs.update
rs.close
response.write("<Script language=JavaScript>alert('留言添加成功！')</Script>")
Response.Write("<script>window.location ='content.asp'</script>")
else
response.write("<Script language=JavaScript>alert('昵称和内容都不能为空！')</Script>")
Response.Write("<script>window.location ='content.asp'</script>")
end if
end if
%>
</body>
</html>
