Adding values in the rows of a table?

i have a table with 3 columns and i need to get the sum of the values in the second coloumn I am keeping an ID which is used to identify cells of addition. I need to do it in J query ?I would like to know how I can able to acess each rows and colums of a table using for loop.

<table>
    <tr>
        <td>ID</td>
        <td>Mark</td>
    <tr>
        <td>1</td>
        <td>40</td>
    </tr>
    <tr>
        <td>2</td>
        <td>35</td>
    </tr>
    <tr>
        <td>1</td>
        <td>52</td>
    </tr开发者_高级运维>
</table>

Can I able to access each rows using some indexes like #tbl[row][col] etc .Thnaks In Advance I NEED TO ADD THE VALUES WHERE ID WILL BE ONE THAT IS EXPECTED OUTPUT IS 92[40+52]

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Something like this would work:

​function getTotal(id) {
  var total = 0;
  $("td:first-child").filter(function() { return this.innerHTML == id; })
      .next().each(function() { total += parseInt(this.innerHTML, 10); });
  return total;           
}

For example:

alert(getTotal(1)); // alerts 92
alert(getTotal(2)); // alerts 35

You can test it out here., what this does is get the first columns of cells, does a .filter() down to those that match the ID (don't use :contains() here, it's a substring match) then for the matches, get the neighboring cell using .next(). For those cells we're just using praseInt() to get the number and add it to the total.