jquery - How to subtract from list of numbers individually? -

what want subtract list on numbers 1 number. example have in table following numbers , want subtract 4000:

<table> <thead>    <tr>       <td>result</td>       <td>start</td>    <tr> </thead> <tbody>    <tr>       <td>0</td>       <td>3000</td>    </tr>    <tr>       <td>0</td>       <td>3500</td>    </tr>    <tr>       <td>0</td>       <td>4000</td>    </tr> </tbody> </table> 

a perfect result this:

<table> <thead>    <tr>       <td>result</td>       <td>start</td>    <tr> </thead>    <tbody>    <tr>       <td>0</td>       <td>3000</td>    </tr>    <tr>       <td>2500</td>       <td>3500</td>    </tr>    <tr>       <td>4000</td>       <td>4000</td>    </tr>    </tbody> </table> 

here's link i've tried already:

http://jsfiddle.net/tiitremmel/lbjvj/9/

does want? jsfiddle

edit: new version!

var subtract = 4000;  $('#tbl tbody tr').each(function(){     var value = parseint($(this).find('td:eq(1)').text());     var $result = $(this).find('td:eq(0)');      if(subtract >= value){         $result.text(0);         subtract -= value;     }     else if(subtract <= 0){         $result.text(value);     }     else{         $result.text(value-subtract);         subtract -= value;     } });