<select name="select" class="reg_tdform_2" id="sel1" onChange="changeSound();">
        <option selected="selected" value="<%=basePath%>sound/111.wav">报警声音1</option>
        <option value="<%=basePath%>sound/222.wav">报警声音2</option>
        <option value="<%=basePath%>sound/333.wav">报警声音3</option>
        <option value="<%=basePath%>sound/444.wav">报警声音4</option>
        <option value="<%=basePath%>sound/555.wav">报警声音5</option>
      </select>
      <embed id="alert" src="<%=basePath %>sound/111.wav" loop="false" autostart="false"  mastersound hidden="true" type="application/x-mplayer2" ></embed>
      <img src="<%=basePath %>img/30.gif" width="15px" height="15px" onclick="playSound('play');"/>      

 <script type="text/javascript">
  function changeSound(){
    var obj = document.getElementById("sel1");
    document.write("原本的路径是："+document.getElementById("alert").src);
      selindex = obj.selectedIndex;  
      document.write("选择了第"+selindex+"个选项");
      sndsrc = obj.options[selindex].value; 
      document.write("该声音的路径是："+sndsrc);
      document.getElementById("alert").src = sndsrc;
  }
 </script>
 <script type="text/javascript">
        function playSound(action){
            var soundControl = document.getElementById("alert");
            if(action=="play"){
                soundControl.play();
            }
        }
    </script>