Re: sum of table rows

I'm not sure if I am getting closer on this or further away.

I have a table that looks like this
[code]
<table>
   <tr id=newPerson>
          <td class="person">first person</td>
          <td class="date"><div class="input"><span class="length>8</
span></div></td>
          <td class="date"><div class="input"><span class="length>8</
span></div></td>
           <td class="date"><div class="input"><span class="length>8</
span></div></td>
  </tr>
     <tr id=newPerson>
          <td class="person">second person</td>
          <td class="date"><div class="input"><span class="length>8</
span></div></td>
          <td class="date"><div class="input"><span class="length>8</
span></div></td>
           <td class="date"><div class="input"><span class="length>8</
span></div></td>
  </tr>
     <tr id=newPerson>
          <td class="person">third person</td>
          <td class="date"><div class="input"><span class="length>8</
span></div></td>
          <td class="date"><div class="input"><span class="length>8</
span></div></td>
           <td class="date"><div class="input"><span class="length>8</
span></div></td>
  </tr>
</table>
[/code]

and i am trying to get the sum of the content of the .length values
for each person seperately.

I have now got this, but I don't seem to be getting anywhere, now I'm
not even able to get the values.
Am I not going about getting the lengths properly?

[code]
var start = 0;
                var totalLength = parseInt(start);
                ("#newPerson").click(function(event){
                var $newPerson = $("#newPerson").children( function(){
                        var len = $newPerson.each(".shift").id;
                        alert(len);
                });
                });
[/code]