mediaplayer控件边上载边拖动进度条播放有关问题

<object class="OBJECT" id="MediaPlayer" align="middle"                                                 classid="CLSID:22d6f312-b0f6-11d0-94ab-0080c74c7e95">  <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="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="4" />  <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="<%=add1%>">  <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="-1" />  <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="-600" />  <param name="WindowlessVideo" value="0" />  <embed type="application/x-oleobject" codebase="http://activex.microsoft.com/activex/controls/mplayer/en/nsmp2inf.cab#Version=5,1,52,701"  flename="mp" src="/Images/xuanchuan.WMV" width="810" height="670"> </embed>  </object>