jQuery multiple radio buttons

<tr>
   <td align="left" style="width: 300px">
      <div id="div_s_0">
         <input type="radio" name="s_0" value="1" />Public
         <input type="radio" name="s_0" value="2" />Not Public
         <input type="radio" name="s_0" value="3" />Confidential
      </div>
   </td>
</tr>
<tr>
   <td align="left" style="width: 300px">
      <div id="div_s_1">
         <input type="radio" name="s_1" value="1" />Public
         <input type="radio" name="s_1" value="2" />Not Public
         <input type="radio" name="s_1" value="3" />Confidential
      </div>
   </td>
</tr>

$(document).ready(function() {
    $("input:radio").click(function() {
        var index = parseInt(this.name.split('_')[1])
    });
});

$($("table").children()[0]).children().length

var rowIndex = $("#mytable tr").index($(this).parents("tr"));
var inputName = $(this).attr("name");
alert("Input Name: " + inputName + "; RowIndex: " + rowIndex);

$("#div_s_0 input[type='radio']").onclick = function() {
    if ($("#div_s_0 input[type='radio']:last").attr('checked') == 'checked') {
    /* add a new element */
    }
}