刷一次变一次图的ASP代码

<%@LANGUAGE="VBSCRIPT" CODEPAGE="936"%>
    <%
     '----------------------------------------------------------------------------------------
     '************************* 随机图片显示 ****************************
     '使用实例:img.asp?list=图片存放目录
     '使用注意:图片目录放于本文件同目录下!需要FSO支持!
     '说明：只要将变化图片放于一个目录下，修改下面程序的（需要修改的地方）成你的目录名称！
     ' 上传本程序和图片文件夹到同一目录下，在发帖时候使用UBB代码形如：即可！
     '----------------------------------------------------------------------------------------
    Function AllPath()
      Dim Domain,GFilePath
      Domain = Request.ServerVariables("SERVER_NAME")
      GFilePath = Request.ServerVariables("PATH_INFO")
      GFilePath = lcase(left(GFilePath,instrRev(GFilePath,"/")))
      AllPath = "http://"&Domain&GFilePath
    End Function

    Function ShowFileList(folderspec)
      Dim Path,objFSO,objFolder,count,objFile,nume,S
      Path = Server.MapPath(folderspec)
      Set objFSO = Server.CreateObject("Scripting.FileSystemObject")
      If objFSO.FolderExists(Path) Then
      Set objFolder = objFSO.GetFolder(Path)
      count = 0
      For Each objFile in objFolder.Files
      count = count+1
      Next
      randomize
      nume = Int((count*rnd)+1)
      S = 0
      ShowFileList = ""
      For Each objFile in objFolder.Files
      S = S + 1
      If S = nume Then
      ShowFileList = objFile.Name
      Exit For
      End If
      Next
      Set objFolder = Nothing
      Else
      ShowFileList = "NO"
      End If
      Set objFSO = Nothing
    End Function

    Dim list,filename,address,str

    list = trim(Request.QueryString("list"))
    if list = "" then
      Response.write "本页需要正确参数引入,您缺少相关的参数！正确格式如下："&AllPath&"img.asp?list=（需要修改的地方）"
      Response.End()
    end if

    filename = ShowFileList("./"&list&"/")
    if filename = "NO" then
      Response.write "您指定的目录<b>"&list&"</b>不存在，请重新指定！"
      Response.End()
    end if

    if filename = "" then
      Response.write "您指定的目录<b>"&list&"</b>没有相关的图片文件存在，请重新指定！"
      Response.End()
    end if

    str = right(filename,3)
    if str<>"jpg" and str<>"gif" then
    filename = "erro.gif"
    end if

    address = AllPath&list&"/"
    address = address&filename
    %>
    <%Response.redirect(address)%>

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