表单页面：login.asp

<form name="form1" action="check_form.asp" method="post">
  <div align="center">
    <p>     </p>
    <table width="362" height="252" border="0" cellpadding="0" cellspacing="0">
      <tr>
        <td height="156" valign="top" background="images/00.jpg"><table width="323" height="171" border="0" align="center" cellpadding="0" cellspacing="0">
          <tr>
            <td height="43" colspan="2"> </td>
          </tr>
          <tr>
            <td width="86" height="77" valign="bottom">　 用户名；</td>
            <td width="237" valign="bottom"><div align="left">
              <input type="text" name="textfield2">
            </div></td>
          </tr>
          <tr>
            <td height="23">　 密　码：</td>
            <td height="23"><div align="left">
              <input type="text" name="textfield22">
            </div></td>
          </tr>
          <tr>
            <td height="27" colspan="2">              　　　　　　
              <div align="center">
                  <input type="submit" name="action2" value="提交">　
                　
                  <input type="reset" name="Submit" value="重置">
              </div></td>
          </tr>
        </table></td>
      </tr>
    </table>
    <p><br>
        </p>
  </div>
</form>

检测页面：check_form.asp

      <%
ServerName1=Cstr(Request.ServerVariables("HTTP_REFERER"))
ServerName2=Cstr(Request.ServerVariables("SERVER_NAME"))
if Mid(ServerName1,8,len(ServerName2))<>ServerName2 then
  Response.Write "禁止从网站外部提交表单！！"
end if
%>