求组!关于asp参数传递和保留的问题!搞了两天了!!

想写个基于FSO的文件管理起!但是返回上一目录中遇到到难题!请高手指点!这里返回上一级目录老是出错!还有显示当前目录文件夹也那里有问题!
希望大哥些帮帮忙!
这是演示地址:http://yuzhuang.host001.e80888.com/fso.asp
下面是代码

<script language=javascript>

 function	chfolder(selectitem){

	form=document.forms[0];

	form.selectItem.value=selectitem;

		form.submit();

}

</script>

<%

	 Dim fs, f, f1, s, sf

	set fs=server.CreateObject("scripting.filesystemobject")

	on error resume next

	path="d:\e8088\echsop"

	hostdir=""

	selectItem=Request("selectItem")

	hostdir=Request("hostdir")

	hostdir2=hostdir+"\"+selectItem

	basedir=request("basedir")

if basedir="" then 

	set f=fs.GetFolder(path)

else

	if selectItem=".." then

		lastbasedir=basedir

		set f=fs.GetFolder(lastbasedir)

	else 

		path=basedir+"\"+selectItem

		set f=fs.GetFolder(path)

	end if

end if

	set sf=f.SubFolders

%>

<table width="800" border="0" align="center" cellpadding="0" cellspacing="0" >

<form name=form1 method=post action="fso.asp"/>

 	<input type=hidden name="selectItem" value=""/>

  	<input type=hidden name="basedir" value="<%=path%>" />

	<input type=hidden name="hostdir" value="<%=hostdir2%>" />

<tr > 

	<td colspan="3" background="image/floder_top.gif" height="26"> </td>

</tr>

<tr>

<td background="image/floder_left.gif" width="7" ></td>

	<td>

		<table width="100%" border="0" bgcolor="#FFFFFF" cellpadding="0" cellspacing="0"> 

			<tr>

				<td height="33" colspan="5" valign="middle" background="image/dir_back.gif">

					<table width="100%" height="24" border="0" cellpadding="0" cellspacing="0">

						<tr>

							<td valign="middle" width="24"><img src="image/back_floder.gif" width="24" height="24" border="0" /></td>

							<td width="110" ><a href="javascript:chfolder('..');" title="返回上级目录">返回上级目录</a></td>

							<td width="44" style="border:0px;" background="image/dir_left.gif"></td>

							<td background="image/dir_middle.gif" width="560" style="border:0px;"><%=hostdir2%></td>

							<td width="44" style="border:0px;"  background="image/dir_right.gif"></td>

						</tr>

					</table>

			  </td>

			</tr>

			<tr>

				<td background="image/type.gif" >  名称</td>

				<td align="right" background="image/type.gif" height="33">大小</td>

				<td background="image/type.gif" >    </td>

				<td align="left" background="image/type.gif">类型</td>

				<td align="left" background="image/type.gif">修改时间</td>

		<%

		For Each f1 in sf

	%>

	</tr>

	<tr>

		<td>

			  <a href="javascript:chfolder('<%=f1.name%>');" title="点击选择文件夹<%=f1.name%>"><img src="image/folder.gif" width="16" height="16" border="0"/><%=f1.name%></a>

		</td>

		<td align="center"></td>

		<td>    </td>

		<td align="left"><%=f1.Type%></td>

		<td align="left"><%=f1.DateLastModified%></td>

  </tr>

	<%

	next 

	%>

	<%

	set objFiles=f.Files

	for each objFile in objFiles

	%>

	<tr>

		<td>  <%=objFile.name%></td>

		<td align="right">

			<% 

			if (objFile.Size\1024)<>"0" then 

				Response.Write(objFile.Size\1024&"Kb")

				else

				Response.Write(objFile.Size&"K")

			end if

			%>

		<td>    </td>

		<td align="left"><%=objFile.Type%></td>

		<td align="left"><%=objFile.DateLastModified%></td>

	</tr>

	<%

	next

	set f1=nothing

	set f=nothing

	set fs=nothing

%>

</table>

</td>

<td background="image/floder_right.gif" width="7"></td>

</tr>

<tr>

	<td colspan="3" background="image/floder_bottom.gif" height="77"> </td>

</tr>

</table>