freetextbox 问题

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Show_Edit.aspx.cs" Inherits="admin_News_Edit" EnableEventValidation="false"%>
<%@ Register TagPrefix="ftb" Namespace="FreeTextBoxControls" Assembly="FreeTextBox" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title></title>
      <link href="img/admin_css.css" rel="stylesheet" type="text/css" />
                     <SCRIPT>
function loadThreadFollow(t_id,b_id){
var targetImg =eval("document.all.followImg" + t_id);
var targetDiv =eval("document.all.follow" + t_id);
if ("object"==typeof(targetImg)){
if (targetDiv.style.display!='block'){
targetDiv.style.display="block";

}else{
targetDiv.style.display="none";
}
}
}
</SCRIPT>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
<table width="786" border="0" cellpadding="0" cellspacing="1" bgcolor="#E2E2E2">
  <tr>
    <td height="30" colspan="2" align="center"  bgcolor="#757575"  class="font_1">发　布　展　会</td>
  </tr>
  <tr>
    <td height="32" align="right" bgcolor="#F2F2F2">分类：</td>
    <td bgcolor="#FAFAFA"><asp:DropDownList ID="DropDownList1" runat="server">
        <asp:ListItem Selected>请选择</asp:ListItem>
        <asp:ListItem>国内展会</asp:ListItem>
        <asp:ListItem>国外展会</asp:ListItem>
        <asp:ListItem>展会常识</asp:ListItem>
        <asp:ListItem>展馆介绍</asp:ListItem>
        </asp:DropDownList>        </td>
  </tr>
  <tr>
    <td width="17%" height="32" align="right" bgcolor="#F2F2F2">标题：</td>
    <td width="83%" bgcolor="#FAFAFA"><asp:TextBox ID="TextBox1" runat="server" Width="310px"></asp:TextBox></td>
  </tr>
  <tr>
    <td height="32" align="right" bgcolor="#F2F2F2">时间：</td>
    <td bgcolor="#FAFAFA"><asp:TextBox ID="TextBox2" runat="server" MaxLength="20" ReadOnly="True" ></asp:TextBox>
            <div  id="calendarDateAndTimeContainer" style="width: 100px; height: 60px; z-index:1999; position:absolute; top:0px; left:400px" runat="server">
                                                        &nbsp;
                                                        
                                                        <asp:Calendar ID="calendar" runat="server" BackColor="#FFFFCC" BorderColor="#FFCC66"
                                                            BorderWidth="1px" DayNameFormat="Shortest" Font-Names="Verdana"
                                                            Font-Size="8pt" ForeColor="#663399" Height="200px" OnSelectionChanged="calendar_SelectionChanged"
                                                            Width="220px" Visible="False" ShowGridLines="True">
                                                            <SelectedDayStyle BackColor="#CCCCFF" Font-Bold="True" />
                                                            <TodayDayStyle BackColor="#FFCC66" ForeColor="White" />
                                                            <SelectorStyle BackColor="#FFCC66" />
                                                            <OtherMonthDayStyle ForeColor="#CC9966" />
                                                            <NextPrevStyle Font-Size="9pt" ForeColor="#FFFFCC" />
                                                            <DayHeaderStyle BackColor="#FFCC66" Height="1px" Font-Bold="True" />
                                                            <TitleStyle BackColor="#990000" Font-Bold="True"
                                                                Font-Size="9pt" ForeColor="#FFFFCC" />
                                                        </asp:Calendar>
                                                    </div>
                                              <asp:ImageButton ID="imgCalendar" runat="server" ImageUrl="img/calendar.gif" OnClick="imgCalendar_Click" />    </td>
  </tr>
    <tr>
    <td height="32" align="right" bgcolor="#F2F2F2">地点：</td>
    <td bgcolor="#FAFAFA"><asp:TextBox ID="TextBox3" runat="server"></asp:TextBox></td>
  </tr>
      <tr>
    <td height="32" align="right" bgcolor="#F2F2F2">来源：</td>
    <td bgcolor="#FAFAFA"><asp:TextBox ID="TextBox4" runat="server"></asp:TextBox></td>
  </tr>
  <tr>
    <td height="32" align="right" bgcolor="#F2F2F2">新闻图片：</td>
    <td bgcolor="#FAFAFA">
    <asp:TextBox ID="txtProImg" runat="server" Width="169px"></asp:TextBox><SPAN id=followImg1 style="CURSOR: hand"  onclick=loadThreadFollow(1,5)>上传图片↓</SPAN>    </td>
  </tr>
      <tr  id=follow1 style="DISPLAY: none">
    <td height="32" align="right" bgcolor="#F2F2F2"></td>
    <td bgcolor="#FAFAFA"><asp:FileUpload ID="FileUpload1" runat="server" Width="247px"  Height="22" />
        <asp:Button ID="UpImg" runat="server" Text="上传" OnClick="UpImg_Click"/></td>
  </tr>
  <tr>
    <td height="400" align="right" bgcolor="#F2F2F2">内容：</td>
    <td bgcolor="#FAFAFA">
    
    
        <ftb:FreeTextBox ID="ftbContent" runat="server" Text="ddss">
        
        
        </ftb:FreeTextBox>
    
    
    
    </td>
  </tr>
  <tr>
    <td height="32" align="right" bgcolor="#F2F2F2">是否锁定：</td>
    <td bgcolor="#FAFAFA"><asp:CheckBox ID="CheckBox1" runat="server" Text="选中为锁定" /></td>
  </tr>
 <%-- <tr>
    <td height="32" align="right" bgcolor="#F2F2F2">首页显示：</td>
    <td bgcolor="#FAFAFA"><asp:CheckBox ID="CheckBox2" runat="server" Text="选中为显示" /></td>
  </tr>--%>
  <tr>
    <td height="43" align="right" bgcolor="#F2F2F2">&nbsp;</td>
    <td bgcolor="#FAFAFA"><div style=" padding-left:230px;">
      <asp:Button ID="Button1" runat="server" Text="确认执行" OnClick="Button1_Click" /></div></td>
  </tr>
</table>    
    </div>
    </form>
</body>
</html>
错误提示freetextbox没有放到form标记窗体内，没有runnat=server 窗体内