windowsmediaplay中控制從wmv的指定時間開始播放，指定時間停止播放

1、Mediaplay播放器插入方法 
插入-媒體-ActiveX 
屬性設置： 
ClassID：CLSID:6BF52A52-394A-11d3-B153-00C04F79FAA6 
參數： 
URL：文件路徑名稱 
PlayCount ：整數 
AutoStart ：自動播放：1 不播放：0 
fullScreen ：是否自動全屏 0不1是 
volume ：0-100 
代碼 
1.window.media.player 
<object classid="clsid:22D6F312-B0F6-11D0-94AB-0080C74C7E95" id="MediaPlayer1" width="286" height="225"> 
<param name="AudioStream" value="-1"> 
<param name="AutoSize" value="-1"> 
<param name="AutoStart" value="-1"> 
<param name="AnimationAtStart" value="-1"> 
<param name="AllowScan" value="-1"> 
<param name="AllowChangeDisplaySize" value="-1"> 
<param name="AutoRewind" value="0"> 
<param name="Balance" value="0"> 
<param name="BaseURL" value> 
<param name="BufferingTime" value="5"> 
<param name="CaptioningID" value> 
<param name="ClickToPlay" value="-1"> 
<param name="CursorType" value="0"> 
<param name="CurrentPosition" value="-1"> 
<param name="CurrentMarker" value="0"> 
<param name="DefaultFrame" value> 
<param name="DisplayBackColor" value="0"> 
<param name="DisplayForeColor" value="16777215"> 
<param name="DisplayMode" value="0"> 
<param name="DisplaySize" value="0"> 
<param name="Enabled" value="-1"> 
<param name="EnableContextMenu" value="-1"> 
<param name="EnablePositionControls" value="-1"> 
<param name="EnableFullScreenControls" value="0"> 
<param name="EnableTracker" value="-1"> 
<param name="Filename" value="你的多媒體文件名"> 
<param name="InvokeURLs" value="-1"> 
<param name="Language" value="-1"> 
<param name="Mute" value="0"> 
<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="0"> 
<param name="SendMouseMoveEvents" value="0"> 
<param name="SendPlayStateChangeEvents" value="-1"> 
<param name="ShowCaptioning" value="0"> 
<param name="ShowControls" value="-1"> 
<param name="ShowAudioControls" value="-1"> 
<param name="ShowDisplay" value="0"> 
<param name="ShowGotoBar" value="0"> 
<param name="ShowPositionControls" value="-1"> 
<param name="ShowStatusBar" value="0"> 
<param name="ShowTracker" value="-1"> 
<param name="TransparentAtStart" value="0"> 
<param name="VideoBorderWidth" value="0"> 
<param name="VideoBorderColor" value="0"> 
<param name="VideoBorder3D" value="0"> 
<param name="Volume" value="-320"> 
<param name="WindowlessVideo" value="0"> 
</object> 
里面的SelectionStart SelectionEnd是如何用的，可否控制wmv從一個指定的幀開始，到一個指定的幀結束。 
請高手作答，謝謝 
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<param name="CurrentPosition" value="200"> 
這里設置為視頻開始播放的時間 
頁面onload=SetPause() 
function SetPause(){ 
setTimeout("pause()",1000); 
} 
function pause(){ 
var current_time = document.getElementById("mediaplayer1").controls.currentPosition; 
if (current_time>parseInt('1261.230')){ 
toPlay(); 
}else{ 
setTimeout("pause()",1000); 
} 
}