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var Day = document.getElementById("Day");
根本没这个对象啊
我忘写了，可以不要它，不过Month也不行啊！
就是因为DAY对象不存在,所以导致这个错误了.
是myForm.Month.add这个地方对象不存在。
var Day = document.getElementById("Day");
这一行就在myForm.Month.add下面.系统提示的行数有时候并不是很精确的,比如有些时候你某个地方少个;或} 系统并不会在那行提示错误,反而会在其他行报错.
我本来程序中有<select id=Day name=Day></select>的我这儿没写出来，它提示的是"myForm.Month"为空或不是对象。
<%@ Page language="c#" Codebehind="Update.aspx.cs" AutoEventWireup="false" Inherits="F1.User.Update" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>个人设置</title>
<meta content="Microsoft Visual Studio 7.0" name="GENERATOR">
<meta content="C#" name="CODE_LANGUAGE">
<meta content="JavaScript" name="vs_defaultClientScript">
<meta content="http://schemas.microsoft.com/intellisense/ie5" name="vs_targetSchema">
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<LINK href="../main.css" type="text/css" rel="stylesheet">
<script src="/Common/F1.js"></script>
<script language="javascript">
function today(){
var today = new Date();
var Year = today.getFullYear();
var Month = today.getMonth();
var Day = today.getDate();

var Month = document.getElementById("Month");
for (var i=1; i<13; i++)
{ var selector = i;
var Option = document.createElement("option");
Option.text = selector;
Option.value = selector;
Month.add(Option);
}

var Day = document.getElementById("Day");
for (var i=1; i<32; i++)
{ var selector = i;
var Option = document.createElement("option");
Option.text = selector;
Option.value = selector;
Day.add(Option);
}

myForm.Month.value=<%=iMonth%>;
myForm.Day.value=<%=iDay%>;
var iyear=<%=iYear%>;
if(iyear=="9999"||iyear==0)
myForm.Year.value="";
else
myForm.Year.value=iyear;

}

function Select(){

var  day = document.all.Month.value;
var Day = document.getElementById("Day");

if(day==1||day==3||day==5||day==7||day==8||day==10||day==12)
{
Day.innerHTML="";
for (var i=1; i<32; i++)
{
var selector = i;
var Option = document.createElement("option");
Option.text = selector;
Option.value = selector;
Day.add(Option);
}
}
else if(day==4||day==6||day==9||day==11)
{
Day.innerHTML="";
for (var i=1; i<31; i++)
{
var selector = i;
var Option = document.createElement("option");
Option.text = selector;
Option.value = selector;
Day.add(Option);

}
}
else
{
Day.innerHTML="";
var iyear=myForm.Year.value;
if((iyear%4==0)&&(iyear%100!=0)||(iyear%400==0))
for(var i=1;i<30;i++)
{
var selector = i;
var Option = document.createElement("option");
Option.text = selector;
Option.value = selector;
Day.add(Option);
}

else
{
Day.innerHTML="";
for(var i=1;i<29;i++)
{
var selector = i;
var Option = document.createElement("option");
Option.text = selector;
Option.value = selector;
Day.add(Option);

}
}
}
}
</script>
</HEAD>
<body bottomMargin="0" leftMargin="0" topMargin="0" onload="today();" rightMargin="0">
<table height="100%" cellSpacing="0" cellPadding="0" width="100%" align="center" border="0">
<tr>
<td vAlign="top" align="left" background="/images/manage_title_bk.gif" height="60">
<table cellSpacing="0" cellPadding="0" width="100%" border="0">
<tr>
<td><IMG src="images/manage_title.gif"></td>
<td vAlign="top" align="right">
<table cellSpacing="10" cellPadding="0" border="0">
<tr>
<td width="35"><A class="manage_link_close" href="javascript:doOK();">关闭</A></td>
</tr>
</table>
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td height="18"> </td>
</tr>
<tr>
<td vAlign="top" align="center">
<table cellSpacing="0" cellPadding="0" width="94%" align="center" border="0">
<tr>
<td align="left">
<table height="21" cellSpacing="0" cellPadding="0" background="../images/manage_sheet_bk.gif"
border="0">
<tr>
<td bgColor="#ff6600">  <span class="textWithe">修改注册资料</span>  </td>
<td width="1" bgColor="#ffffff"></td>
<td>  <A class="manage_sheet" href="PasswordChange.aspx">修改密码</A>  </td>
<td width="1" bgColor="#ffffff"></td>
<td>  <A class="manage_sheet" href="PasswordProtect.aspx">申请密码保护</A>  </td>
</tr>
</table>
</td>
</tr>
</table>
<table cellSpacing="1" cellPadding="0" width="94%" align="center" bgColor="#ff6600" border="0">
<tr>
<td bgColor="#ffffff">
<table cellSpacing="0" cellPadding="0" border="0">
<tr>
<td> </td>
</tr>
<tr>
<td width="12"> </td>
<td><IMG src="../images/manage_title_arrow.gif"></td>
<td><strong>当前位置</strong>：个人设置 >> 修改用户个人资料
</td>
</tr>
<tr>
<td> </td>
</tr>
</table>
<table cellSpacing="0" cellPadding="0" width="100%" border="0">
<tr>
<td bgColor="#ababab"><img height="1" alt="" src="" width="1" name=""></td>
</tr>
</table>
<table cellSpacing="0" cellPadding="0" width="100%" bgColor="#f7f7f7">
<tr>
<td>
<form id="myForm" onsubmit="return CheckForm();" method="post" encType="multipart/form-data"
runat="server">
<asp:panel id="PanelForm" runat="server">
<TABLE cellSpacing="0" cellPadding="2" align="center" border="0">
<TR>
<TD width="100"><%= PrintUserFace() %></TD>
<TD vAlign="top">
<TABLE cellSpacing="0" cellPadding="0" width="100%" border="0">
<TR>
<TD class="textOrange" vAlign="top" height="22">·用户名：<B>
<asp:Label id="UserName" runat="server">UserName</asp:Label></B></TD>
</TR>
<TR>
<TD height="30"><INPUT onclick="ChangeFacePanel(0);" type="radio" CHECKED value="0" name="FaceType">选择头像
<INPUT onclick="ChangeFacePanel(1);" type="radio" value="1" name="FaceType">上传头像
</TD>
</TR>
<TR>
<TD>
我这下面3行注释掉了
//myForm.Month.value=<%=iMonth%>;
//myForm.Day.value=<%=iDay%>;
//var iyear=<%=iYear%>;这样子程序是可以正常跑下去的
说明你函数没问题。
试试看把这3行这样写:
myForm.Month.value="<%=iMonth%>";
myForm.Day.value="<%=iDay%>";
var iyear="<%=iYear%>";
<HTML>
<HEAD>
<title>个人设置</title>
<meta content="Microsoft Visual Studio 7.0" name="GENERATOR">
<meta content="C#" name="CODE_LANGUAGE">
<meta content="JavaScript" name="vs_defaultClientScript">
<meta content="http://schemas.microsoft.com/intellisense/ie5" name="vs_targetSchema">
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<LINK href="../main.css" type="text/css" rel="stylesheet">

<script language="javascript">
function today(){
var today = new Date();
var Year = today.getFullYear();
var Month = today.getMonth();
var Day = today.getDate();

var Month = document.getElementById("Month");
for (var i=1; i<13; i++)
{ var selector = i;
var Option = document.createElement("option");
Option.text = selector;
Option.value = selector;
Month.add(Option);
}

var Day = document.getElementById("Day");
for (var i=1; i<32; i++)
{ var selector = i;
var Option = document.createElement("option");
Option.text = selector;
Option.value = selector;
Day.add(Option);
}

//myForm.Month.value=<%=iMonth%>;
//myForm.Day.value=<%=iDay%>;
//var iyear=<%=iYear%>;
var iyear;
if(iyear=="9999"||iyear==0)
myForm.Year.value="";
else
myForm.Year.value=iyear;

}

function Select(){

var  day = document.all.Month.value;
var Day = document.getElementById("Day");

if(day==1||day==3||day==5||day==7||day==8||day==10||day==12)
{
Day.innerHTML="";
for (var i=1; i<32; i++)
{
var selector = i;
var Option = document.createElement("option");
Option.text = selector;
Option.value = selector;
Day.add(Option);
}
}
else if(day==4||day==6||day==9||day==11)
{
Day.innerHTML="";
for (var i=1; i<31; i++)
{
var selector = i;
var Option = document.createElement("option");
Option.text = selector;
Option.value = selector;
Day.add(Option);

}
}
else
{
Day.innerHTML="";
var iyear=myForm.Year.value;
if((iyear%4==0)&&(iyear%100!=0)||(iyear%400==0))
for(var i=1;i<30;i++)
{
var selector = i;
var Option = document.createElement("option");
Option.text = selector;
Option.value = selector;
Day.add(Option);
}

else
{
Day.innerHTML="";
for(var i=1;i<29;i++)
{
var selector = i;
var Option = document.createElement("option");
Option.text = selector;
Option.value = selector;
Day.add(Option);

}
}
}
}
</script>
</HEAD>
<body onload="javascript:today();">
    <table cellSpacing="1" cellPadding="0" width="94%" align="center" bgColor="#ff6600" border="0">
      <tr>
        <td bgColor="#ffffff">
          <table cellSpacing="0" cellPadding="0" width="100%" border="0">
            <tr>
              <td bgColor="#ababab"><img height="1" alt="" src="" width="1" name=""></td>
            </tr>
          </table>
          <table cellSpacing="0" cellPadding="0" width="100%" bgColor="#f7f7f7">
            <tr>
              <td>
                <form id="myForm" onsubmit="return CheckForm();" method="post" encType="multipart/form-data"
runat="server">
                  <asp:panel id="PanelForm" runat="server">
                    <TABLE cellSpacing="0" cellPadding="2" align="center" border="0">
                      <TR>
                        <TD width="100" class="textOrange" style="HEIGHT: 16px">
                        <TD style="HEIGHT: 16px"><INPUT id="Year" onkeydown="onlyNum();" type="text" maxLength="4" size="8" name="Year">
                            <SELECT id="Month" onchange="Select()" name="Month">
                            </SELECT>
                            <SELECT id="Day" name="Day">
                          </SELECT></TD>
                      </TR>
                    </TABLE>
                  </asp:panel>
                  <asp:panel id="PanelOK" runat="server"> </asp:panel>
                  <asp:panel id="PanelERR" runat="server"></asp:panel>
              </form></td>
            </tr>
        </table></td>
      </tr>
    </table>
</body>
</HTML>
我都把那几行
myForm.Month.value=<%=iMonth%>;
myForm.Day.value=<%=iDay%>;
var iyear=<%=iYear%>;
if(iyear=="9999"||iyear==0)
myForm.Year.value="";
else
myForm.Year.value=iyear;
去掉了，还是什么“myForm.Month”不是对象，好象和onload()有关吧。
对不起，忘了说了。onload我也改过了
<body onload="javascript:today();">
我就改了ONLOAD和注释了那3行，可以运行。但是我是把你的函数单独拿出来的。其他的部分我都丢弃了。就是我贴给你的那段代码。你运行下我给你的那段，可以的话就说明函数没问题的。
我找到原因了，是因为里面有个<asp:panel id="PanelForm" runat="server"> 。如果把<select id=month>放到它的外面就可以了。可是怎么解决呢，我不想放到外面啊。
晕。这个我没办法了。这个是不是.NET啊。我可没学过。:(