asp修改xml文件，各位大虾指点下。

分不多，请谅解。急

xml如下：
<?xml version="1.0" uncoding="utf-8"?>
<site>
<newlist names="luhehe" urls="www.baidu.com" mail="hehe@第一条留言</newlist>
<newlist names="lheiheie" urls="www.baidu.com" mail="hehheie@第二条留言</newlist>
</site>
代码如下：
strFile=Server.MapPath("xml\list.xml")

Set objXML=server.CreateObject("microsoft.xmldom")

objxml.async = "false"

objXML.load(strFile)

Set newnode=objXML.createElement("newlist")

newnode.text="第十条留言"

Set newatt=objXML.createNode("attribute","names","")

newatt.text="hahahaha"

newnode.SetAttributeNode newatt

Set newatt=objXML.createNode("attribute","urls","")

newatt.text="www.baidu.com"

newnode.SetAttributeNode newatt

Set newatt=objXML.createNode("attribute","mail","")

newatt.text="hahahaha@

newnode.SetAttributeNode newatt

set objNode = objXML.documentElement.selectsinglenode("site")

objNode.appendChild newnode

objXML.save(strFile)
错误如下：
Script error detected at line 38.
Source line: set objNode = objXML.documentElement.selectsinglenode("newlist")
Description: 缺少对象: 'objXML.documentElement'


请帮我解决下好么，我是想通过asp接收flash传过来的值 写进xml 然后再直接用flash 遍历xml 这样的方式 做一个 留言板，