jsp 里面 播放 mpg 问题，第一次打开的时候 速度非常的慢，第2次就不会，怎么回事情

<%@  page  contentType="text/html;charset=gb2312" %>  
  <HTML> <HEAD> <TITLE>ActiveMovie  Embedded  MPG  Object  Test  Page </TITLE> </HEAD> 
  <script type="text/javascript"> function playpre(){ 
var phxUrl=document.getElementById('phx'); 
phxUrl.Filename="/images/12.mpg"; 
  
} 
</script> 
  <BODY>  
  
<OBJECT id="phx"  width="430" height="329" align=baseline border=0 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="0"> 
<PARAM NAME="AllowScan" VALUE="0"> 
<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="0"> 
<PARAM NAME="CursorType" VALUE="0"> 
<PARAM NAME="CurrentPosition" VALUE="-1"> 
<PARAM NAME="CurrentMarker" VALUE="0"> 
<PARAM NAME="DefaultFrame" VALUE="datawindow"> 
<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="InvokeURLs" VALUE="-1"> 
<PARAM NAME="Language" VALUE="-1"> 
<PARAM NAME="Mute" VALUE="0"> 
<PARAM NAME="PlayCount" VALUE="0"> 
<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="0"> 
<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="0"> 
<PARAM NAME="WindowlessVideo" VALUE="0"> 
<PARAM NAME="Filename" VALUE="/images/11.mpg" valuetype="ref"> 
</OBJECT> <table width="98%" border="0" cellspacing="0" cellpadding="0"> 
                    <tr> 
                      <td height="25" > <span class="STYLE1">· </span>《 <a href="down.html">重伤之罪恶都市》 </a> </td> 
                      <td class="STYLE1" > <a href="#" onclick="playpre();">播放 </a> </td> 
                    </tr> 
                    <tr> 
                      <td height="25" > <span class="STYLE1">· </span>《重伤之罪恶都市》 </td> 
                      <td class="STYLE1" > <a href="down.html">播放 </a> </td> 
                    </tr> 
                    <tr> 
                      <td height="25" > <span class="STYLE1">· </span>《重伤之罪恶都市》 </td> 
                      <td class="STYLE1" > <a href="down.html">播放 </a> </td> 
                    </tr> 
                    <tr> 
                      <td height="25" > <span class="STYLE1">· </span>《重伤之罪恶都市》 </td> 
                      <td class="STYLE1" > <a href="down.html">播放 </a> </td> 
                    </tr> 
                    <tr> 
                      <td height="25" > <span class="STYLE1">· </span>《重伤之罪恶都市》 </td> 
                      <td class="STYLE1" > <a href="down.html">播放 </a> </td> 
                    </tr> 
                    <tr> 
                      <td height="25" > <span class="STYLE1">· </span>《重伤之罪恶都市》 </td> 
                      <td class="STYLE1" > <a href="down.html">播放 </a> </td> 
                    </tr> 
<tr> 
                      <td height="25" > <span class="STYLE1">· </span>《重伤之罪恶都市》 </td> 
                      <td class="STYLE1" > <a href="down.html">播放 </a> </td> 
                    </tr> 
<tr> 
                      <td height="25" > <span class="STYLE1">· </span>《重伤之罪恶都市》 </td> 
                      <td class="STYLE1" > <a href="down.html">播放 </a> </td> 
                    </tr> <tr> 
                      <td height="25" > <span class="STYLE1">· </span>《重伤之罪恶都市》 </td> 
                      <td class="STYLE1" > <a href="down.html">播放 </a> </td> 
                    </tr> 
<tr> 
                      <td height="25" > <span class="STYLE1">· </span>《重伤之罪恶都市》 </td> 
                      <td class="STYLE1" > <a href="down.html">播放 </a> </td> 
                    </tr> 
<tr> 
                      <td height="25" > <span class="STYLE1">· </span>《重伤之罪恶都市》 </td> 
                      <td class="STYLE1" > <a href="down.html">播放 </a> </td> 
                    </tr> <tr> 
                      <td height="25" > <span class="STYLE1">· </span>《重伤之罪恶都市》 </td> 
                      <td class="STYLE1" > <a href="down.html">播放 </a> </td> 
                    </tr> 
<tr> 
                      <td height="25" > <span class="STYLE1">· </span>《重伤之罪恶都市》 </td> 
                      <td class="STYLE1" > <a href="down.html">播放 </a> </td> 
                    </tr> 
                  </table> </td> 
              </tr> 
            </table> 
</BODY> </html>