Drop down with validation wont work in array of data

Drop down with validation wont work in array of data

I have drop down select field where I can select whether the item is brand new or repo, If I select the repo my hidden account no field (textbox) will show (temporary hide), if I revert back to brand new it will hide again the account no field, the condition is when I select the repo the account no field (textbox) will show but there's a validation that the text-field should not be empty when user  submit the form and account no is blank. What I have done so far.. is good for 1 row only, meaning when I go to 2nd row above the dropdown wont work anymore.

Here's my script. 
  1.  <tr>
<td align='center'>BARAKO 2</td>	
<td align='center'>RED</td>
<td align='center'>100</td>
<td align='center'>100</td>
<td align='center'>
   <select id='new' class='new' name='brand_new[]'>
       <option>Choose</option>
       <option value='brand_new'>Brand New</option>
       <option value='repo'>Repo</option>
   </select> 
 </td>
      <td><div id='repo' class='search_item' style='display:none'>    
       <input type='text' name='account_no' required> 
    </div>
</td>
       <input type='hidden' name='interbranch_id[]' value='9'>     
   </tr>
 <tr>
     <td align='center'>BARAKO 2</td>	
     <td align='center'>RED</td>
     <td align='center'>200</td>
     <td align='center'>200</td>
     <td align='center'>
<select id='new' class='new' name='brand_new[]'>
     <option>Choose</option>
     <option value='brand_new'>Brand New</option>
     <option value='repo'>Repo</option>
 </select> 
     </td>
   <td><div id='repo' class='search_item' style='display:none'>    
<input type='text' name='account_no' required> 
</div>
</td>
    <input type='hidden' name='interbranch_id[]' value='10'>     
</tr>

  1. <script type="text/javascript">


      $(document).ready(function() {
           
        // Search by dates function
        var search = $('#new')

        search.change(function() {
            $('.search_item').hide()
            $('#' + $(this).val()).show()

        });

      });
    </script>