高拍仪软件通用版:ASP 程序自动运行问题

代码是
<%
Function GetPage(url)
'获得文件内容
dim Retrieval
Set Retrieval = CreateObject("Microsoft.XMLHTTP")
With Retrieval
.Open "Get", url, False ', "", ""
.Send
GetPage = BytesToBstr(.ResponseBody)
End With
Set Retrieval = Nothing
End Function

Function BytesToBstr(body)
dim objstream
set objstream = Server.CreateObject("adodb.stream")
objstream.Type = 1
objstream.Mode =3
objstream.Open
objstream.Write body
objstream.Position = 0
objstream.Type = 2
objstream.Charset = "GB2312"
BytesToBstr = objstream.ReadText
objstream.Close
set objstream = nothing
End Function

on error resume next
Url="http://www.so360.cn/corporation/trade.asp?sortid=11"'要读取的页面地址
response.write "开始更新首页..."
wstr = GetPage(Url)

'response.write(wstr)
Set fs=Server.CreateObject("Scripting.FileSystemObject")

'if not MyFile.FolderExists(server.MapPath("/html/")) then
'MyFile.CreateFolder(server.MapPath("/html/"))'
'end if

'要存放的页面地址
dizhi=server.MapPath("index.htm")
If (fs.FileExists(dizhi)) Then
fs.DeleteFile(dizhi)
End If

Set CrFi=fs.CreateTextFile(dizhi)
Crfi.Writeline(wstr)
set CrFi=nothing
set fs=nothing
response.write "...<font color=red>更新完成！</font>"
%>

是一个生成静态的程序

我想让它在每天的 3点、8点50分、18点 自动运行
请大家帮个忙
我就20分了
全给了