请教:关于用ActiveX获取MAC地址的问题

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<OBJECT id="locator" classid="CLSID:76A64158-CB41-11D1-8B02-00600806D9B6" VIEWASTEXT></OBJECT>
<OBJECT id="foo" classid="CLSID:75718C9A-F029-11d1-A1AC-00C04FB6C223"></OBJECT>
<SCRIPT language="JScript">
<!--
var service = locator.ConnectServer();
var m;
service.Security_.ImpersonationLevel=3;
service.InstancesOfAsync(foo, 'Win32_NetworkAdapterConfiguration');
//-->
   </SCRIPT>
<SCRIPT language="JScript" event="OnObjectReady(objObject,objAsyncContext)" for="foo">
<!--
    if(objObject.MACAddress != null && objObject.MACAddress != "undefined")
m = objObject.MACAddress;
//-->
</SCRIPT>
</head><body>
<div id="lab"></div>
<SCRIPT language="JScript" event="OnCompleted(hResult,pErrorObject, pAsyncContext)" for="foo">
document.getElementById("lab").innerHTML = escape(m.toUpperCase());
</SCRIPT>
</body>
</html>