如何实现Javascript 接收realplay的event？

<script language="JScript" for="real" event="RPOnStateChange(ns)">alert("hello")</script>

<EMBED SCRIPTCALLBACKS=All TYPE="audio/x-pn-realaudio-plugin"

autostart="true"
id="real"
width=300
height=200>
</EMBED>

我这个脚本不行哦