JQuery 改指定的内容 设置隐藏内容为可见

<script type="text/javascript" src="./js/jquery-1.2.2.pack.js" ></script>



function judge()      //判断idstream_number里的值。然后根据这个值设置div里的内容是否显示。
    {
        var stream_number_value=document.getElementById("stream_number").value;
        if(stream_number_value==0)
        {
            
          $('#stream_judge2').css("display","none");
          $('#stream_judge3').css("display","none");
          $('#stream_judge4').css("display","none");
      }
        if(stream_number_value==1)
        {
            
          $('#stream_judge2').css("display","");
          $('#stream_judge3').css("display","none");
          $('#stream_judge4').css("display","none");
      }
    
    }




<td>
                    <select name = "stream_number" id="stream_number" style="100" onchange="judge()">
                        <option value = "0" selected="">1</option>
                        <option value = "1">2</option>
                        <option value = "2">3</option>
                        <option value = "3">4</option>        
                    </select>


//被设置的div
<div id="stream_judge2" name="stream_judge2"  style="display:none">
    <fieldset>
 </fieldset>
</div>