javascript中如何取得html的object属性的param的value值？

<body>
<OBJECT classid=CLSID:22D6F312-B0F6-11D0-94AB-0080C74C7E95 codeBase=http://activex.microsoft.com/activex/controls/mplayer/en/nsmp2inf.cab#Version=6,4,05,0809 height=256 id="NSOPlay" type=application/x-oleobject width=245 standby="Connecting with Live Event. Please wait patiently...">
<PARAM NAME="AudioStream" VALUE="-1">
<PARAM NAME="AutoSize" VALUE="0">
<PARAM NAME="AutoStart" VALUE="-1">
<PARAM NAME="AnimationAtStart" VALUE="-1">
<PARAM NAME="AllowScan" VALUE="-1">
<PARAM NAME="AllowChangeDisplaySize" VALUE="-1">
<PARAM NAME="AutoRewind" VALUE="-1">
<PARAM NAME="Balance" VALUE="-1">
<PARAM NAME="BaseURL" VALUE="">
<PARAM NAME="BufferingTime" VALUE="5">
<PARAM NAME="CaptioningID" VALUE="-1">
<PARAM NAME="ClickToPlay" VALUE="-1">
<PARAM NAME="CursorType" VALUE="-1">
<PARAM NAME="CurrentPosition" VALUE="-1">
<PARAM NAME="CurrentMarker" VALUE="-1">
<PARAM NAME="DefaultFrame" VALUE="content">
<PARAM NAME="DisplayBackColor" VALUE="0">
<PARAM NAME="DisplayForeColor" VALUE="16777215">
<PARAM NAME="DisplayMode" VALUE="-1">
<PARAM NAME="DisplaySize" VALUE="-1">
<PARAM NAME="Enabled" VALUE="-1">
<PARAM NAME="EnableContextMenu" VALUE="-1">
<PARAM NAME="EnablePositionControls" VALUE="-1">
<PARAM NAME="EnableFullScreenControls" VALUE="-1">
<PARAM NAME="EnableTracker" VALUE="-1">
<PARAM NAME="Filename" VALUE="http://lucky.myrice.com/play.asx">
<PARAM NAME="InvokeURLs" VALUE="-1">
<PARAM NAME="Language" VALUE="-1">
<PARAM NAME="Mute" VALUE="0">
<PARAM NAME="fullScreen" VALUE="true">
<PARAM NAME="PlayCount" VALUE="-1">
<PARAM NAME="PreviewMode" VALUE="0">
<PARAM NAME="Rate" VALUE="1">
<PARAM NAME="SAMILang" VALUE="">
<PARAM NAME="SAMIStyle" VALUE="">
<PARAM NAME="SAMIFileName" VALUE="">
<PARAM NAME="SelectionStart" VALUE="-1">
<PARAM NAME="SelectionEnd" VALUE="-1">
<PARAM NAME="SendOpenStateChangeEvents" VALUE="-1">
<PARAM NAME="SendWarningEvents" VALUE="-1">
<PARAM NAME="SendErrorEvents" VALUE="-1">
<PARAM NAME="SendKeyboardEvents" VALUE="0">
<PARAM NAME="SendMouseClickEvents" VALUE="-1">
<PARAM NAME="SendMouseMoveEvents" VALUE="-1">
<PARAM NAME="SendPlayStateChangeEvents" VALUE="-1">
<PARAM NAME="ShowCaptioning" VALUE="0">
<PARAM NAME="ShowControls" VALUE="-1">
<PARAM NAME="ShowAudioControls" VALUE="-1">
<PARAM NAME="ShowDisplay" VALUE="-1">
<PARAM NAME="ShowGotoBar" VALUE="0">
<PARAM NAME="ShowPositionControls" VALUE="-1">
<PARAM NAME="ShowStatusBar" VALUE="-1">
<PARAM NAME="ShowTracker" VALUE="-1">
<PARAM NAME="TransparentAtStart" VALUE="-1">
<PARAM NAME="VideoBorderWidth" VALUE="0">
<PARAM NAME="VideoBorderColor" VALUE="0">
<PARAM NAME="VideoBorder3D" VALUE="0">
<PARAM NAME="Volume" VALUE="-450">
<PARAM NAME="WindowlessVideo" VALUE="0">
</OBJECT>
<br>
<input onclick="alert(document.all.NSOPlay.Filename)" type=button value="测试">
<input onclick="alert(document.all.NSOPlay.AutoStart)" type=button value="测试">
</body>