以下、サンプルコード <object id="Player" width="320" height="240" classid="CLSID:6BF52A52-394A-11d3-B153-00C04F79FAA6"> <param name="URL" value="clip.asx"> <param name="uiMode" value="full"> </object> <script for="Player" event="playStateChange(NewState)"> Msg.innerText = NewState; </script>