Det kan det nu godt :))
<HTML>
<HEAD>
<script>
function tjeck(){
alert(winMediaPlayer.ClientID)
}
</script>
</HEAD>
<BODY>
<OBJECT ID="winMediaPlayer" STYLE="height:216px; width:288px"
classid="CLSID:22d6f312-b0f6-11d0-94ab-0080c74c7e95"
CODEBASE="
http://activex.microsoft.com/activex/controls/mplayer/en/nsmp2inf.cab#Version=5,1,52,701"
standby="Loading Microsoft Windows Media Player components..."
type="application/x-oleobject" width="239" height="179">
<PARAM NAME="ShowControls" Value="true">
<PARAM NAME="AutoStart" VALUE="false">
</OBJECT>
<br>
<br>
<a href="#" onClick="tjeck()">tjeck</a>
</html>