Microsoft VBScript 运行时错误 (0x800A01A8) 缺少对象: ''

源代码如下，请帮忙解决
<%@LANGUAGE="VBSCRIPT" CODEPAGE="936"%>
<!-- #include file="Conn.asp" -->
<%
if (Request.ServerVariables("request_method") = "POST") then
Res_name=request("Res_name")
Res_dept=request("Res_dept")
Res_mail=request("Res_mail")
Res_date=request("Res_date")
Res_title=request("Res_title")
Res_start=request("Res_start")
Res_room=request("Res_room")
Res_end=request("Res_end")
Res_desc=request("Res_desc")
if Res_name=empty then
response.write"<script language=JavaScript>{window.alert('对不起，请填写预定人姓名！');window.location.href='javascript:history.go(-1)'}</script>"
end if
if Res_dept=empty then
response.write"<script language=JavaScript>{window.a

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