刷一次变一次图的ASP代码

<%@LANGUAGE="VBSCRIPT" CODEPAGE="936"%> 
<% 
 ---------------------------------------------------------------------------------------- 
 转发时请保留松餍畔?这段声明不并会影响你的显示速度! 
 ************************* 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)%>