js在firefox下怎么控制realplayer

<embed id="realplayer" src="http://k2.dj2t.com/my/200801/025.rm" width=328 height=68 type="audio/x-pn-realaudio-plugin" controls="StatusBar,ControlPanel" autostart="true" loop="true">
<a href="#" onclick="javascript:document.getElementById('realplayer').DoPlay();">Play</a>
<a href="#" onclick="javascript:document.getElementById('realplayer').DoPause();">Pause</a>

<script>
function play(id,url,mode){
    var Madie='',Real=''
    Madie+="<object id='mplayer' width='300' height='50' classid='CLSID:22d6f312-b0f6-11d0-94ab-0080c74c7e95' codebase='http://activex.microsoft.com/activex/controls/mplayer/en/nsmp2inf.cab#Version=6,4,5,715' align='baseline' border='0' standby='Loading Microsoft Windows Media Player components...' type='application/x-oleobject'>\r\n"
    Madie+="<param name='FileName' value='"
    Madie+=url+"'>\r\n"
    Madie+="<param name='ShowControls' value='1'>\r\n"
    Madie+="<param name='ShowPositionControls' value='0'>\r\n"
    Madie+="<param name='ShowAudioControls' value='1'>\r\n"
    Madie+="<param name='ShowTracker' value='1'>\r\n"
    Madie+="<param name='ShowDisplay' value='0'>\r\n"
    Madie+="<param name='ShowStatusBar' value='1'>\r\n"
    Madie+="<param name='AutoSize' value='0'>\r\n"
    Madie+="<param name='ShowGotoBar' value='0'>\r\n"
    Madie+="<param name='ShowCaptioning' value='0'>\r\n"
    Madie+="<param name='AutoStart' value='1'>\r\n"
    Madie+="<param name='PlayCount' value='0'>\r\n"
    Madie+="<param name='AnimationAtStart' value='0'>\r\n"
    Madie+="<param name='TransparentAtStart' value='0'>\r\n"
    Madie+="<param name='AllowScan' value='0'>\r\n"
    Madie+="<param name='EnableContextMenu' value='1'>\r\n"
    Madie+="<param name='ClickToPlay' value='0'>\r\n"
    Madie+="<param name='InvokeURLs' value='1'>\r\n"
    Madie+="<param name='DefaultFrame' value='datawindow'>\r\n"
    Madie+="<embed src='"+url+"' width='440' autostart='true' height='380'>\r\n"
    Madie+="</embed>\r\n"
    Madie+="</object>\r\n"
    Real+="<object classid='clsid:CFCDAA03-8BE4-11CF-B84B-0020AFBBCCFA' name=player width='440' height='380'>\r\n"
    Real+="<param name='_ExtentX' value='4445'>\r\n"
    Real+="<param name='_ExtentY' value='3334'>\r\n"
    Real+="<param name='AUTOSTART' value='true'>\r\n"
    Real+="<param name='SHUFFLE' value='0'>\r\n"
    Real+="<param name='PREFETCH' value='0'>\r\n"
    Real+="<param name='NOLABELS' value='0'>\r\n"
    Real+="<param name='SRC' value='"
    Real+=url+"'>\r\n"
    Real+="<param name='CONTROLS' value='Imagewindow,StatusBar,ControlPanel'>\r\n"
    Real+="<param name='CONSOLE' value='clip1'>\r\n"
    Real+="<param name='LOOP' value='true'>\r\n"
    Real+="<param name='NUMLOOP' value='0'>\r\n"
    Real+="<param name='CENTER' value='0'>\r\n"
    Real+="<param name='MAINTAINASPECT' value='0'>\r\n"
    Real+="<param name='BACKGROUNDCOLOR' value='#000000'>\r\n"
    Real+="<embed src='"+url+"' width='440' autostart='true' height='380'>\r\n"
    Real+="</embed>\r\n"
    Real+="</object>\r\n"
    if(document.getElementById(id).innerHTML==''){
        if (mode=='0'){
        document.getElementById(id).innerHTML = Madie
        }
        if (mode=='1'){
        document.getElementById(id).innerHTML = Real
        }
    }else{
        document.getElementById(id).innerHTML='';
    }
}
</script>
<a href="javascript:" onclick="play('play1','http://www.davidroland.com/oldsite/music/mps3/midaircollision.MP3','0')">放个MTV(打开/隐藏)</a><br/>
<div id="play1"></div><br/>