如何更改jQuery中的标签文本？

我有一个单选按钮列表，单击单选按钮项目时，我必须更改其标签的文本。但由于某种原因，它不起作用。代码如下：

I have a radiobutton list and on click on the radio button item I have to change the text of its label. But for some reason it's not working. Code is below:

<asp:Label ID="lblVessel" Text="Vessel:" runat="server" ></asp:Label>

<script language="javascript">

    $(document).ready(function() {

       $('#rblDiv input').click(function() {
            var selected= $("#rblDiv input:radio:checked").val();
            if(selected == "exportpack") 
            {
              $('#lblVessel').text("NewText");
            }
       });
    });

</script>

请指教

Please Advise