if 要显示的条件 then
response.write "<script language='javascript'>" & chr(13)
response.write "alert('要显示的内容');" & Chr(13)
response.write "window.document.location.href='javascript:history.back(-1);';"&Chr(13) '这一行要不要自己决定
response.write "</script>" & Chr(13)
Response.end
else