首先在服务器端先创建一个程序可以生成XML文件，以返回客户端，（getfolder.asp）
<%
'written by Linzhang Chen ,2003-4-20
' 转载请注明出处和保留此版权信息
response.write ""&chr(13)
response.write "
folders=request("folder")
if folders="/" then
folders=""
end if
dim count
count=0
folders=replace(folders,"..","")
basefolder="../media/"'基准的文件夹路径
newfolder=basefolder&folders
Set fso =server.CreateObject("Scripting.FileSystemObject")
set f=fso.getfolder(server.mappath(newfolder))
set sf=f.subfolders
for each fd in sf'返回指定路径下面的文件夹列表
response.write "
response.write "
response.write "
response.write ""&chr(13)
count=count+1
next
set sf=nothing
set ff=f.Files
for each fi in ff
fname=fi.name
if instr("asf,wma,wmv",lcase(mid(fname,instrrev(fname,".")+1)))>0 then'设定允许返回的文件类型，防止源码泄露
response.write "
response.write "
response.write "
response.write ""&chr(13)
count=count+1
end if
next
'如果该目录下没有文件，就发一个空元素
if count=0 then
response.write "
response.write "
response.write "
response.write ""&chr(13)
end if
response.write ""
set ff=nothing
set f=nothing
set fso=nothing
%>
下面就是客户端的JS的功夫了(selectfile.asp)
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里面还有一个小文件blank.htm用来定义文件和文件夹显示的样式
调用的时候用以下函数，就可以实现以假乱真的服务器端选择文件的效果
function selectfile()
{
var arr = showModalDialog("selectfile.asp?temp="+Math.random(), "", "dialogWidth:453px; dialogHeight:252px; status:0;help:1");
if (arr != null)
{
return arr
}
}