javascript控制media player播放问题

在网页中嵌入了一个media播放器，但是用javascript却不能控制播放和停止，各位高手有没有什么好办法？
<embed id="MediaPlayer1" autostart="0" clicktoplay="0" width="215" showaudiocontrols="1" autorewind="0" autosize="0" name="MediaPlayer1" showcontrols="1" align="bottom" showstatusbar="1" showdisplay="0" animationatstart="0" src="E:\star.wmv" showtracker="1" transparentatstart="0" type="application/x-mplayer2" showgotobar="0" pluginspage="" height="64" defaultframe="datawindow" border="0" showcaptioning="0" enablecontextmenu="1" showpositioncontrols="0" allowscan="1" invokeurls="0" style="visibility:hidden"> </embed>

<a onclick="control();">play </a>

<script type="text/javascript">
    var playstat = true;
    player = document.getElementById('MediaPlayer1');
    if (playstat) {
          playstat = false;
          player.controls.play();
    } else {
          playstat = true;
          player.controls.stop();